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Ontherox
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(c+1)(d+2)=2*5
c+1=2, c=1
d+2=5, d=3
c+d=4
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Thapa
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A shop sells only pens and pencils.
Selling price of a pen is $0.6 and selling price of a pencil is $0.4. The average (arithmetic mean) price of first 25 items sold is $0.44. After selling the first 25 items, the store ran out of pencils to sell.
How many more pens should the store sell so that the average price of total items sold is $0.55?
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Aman_RR
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55 more pens

0.6 P + 0.4 Pencil= 0.44*25=11
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Thapa
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But how is the 55 outcome
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TanyaPriyadarshni
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In an entrance test, a candidate is required to attempt a total of 4 questions which are to be attempted from 2 sections, each containing 5 questions. The maximum number of questions that he can attempt from any section is 3. In how many ways can he answer the test?
(A) 150
(B) 100
(C) 200
(D) 250
(E) 300
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fatema199
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TanyaPriyadarshni
In an entrance test, a candidate is required to attempt a total of 4 questions which are to be attempted from 2 sections, each containing 5 questions. The maximum number of questions that he can attempt from any section is 3. In how many ways can he answer the test? (A) 150 (B) 100 (C) 200 (D) 250 (E) 300
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The correct option is B
200


The number of ways that it can be done =
5C2*5C3+5C3*5C2=200
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piediepie
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TanyaPriyadarshni
In an entrance test, a candidate is required to attempt a total of 4 questions which are to be attempted from 2 sections, each containing 5 questions. The maximum number of questions that he can attempt from any section is 3. In how many ways can he answer the test? (A) 150 (B) 100 (C) 200 (D) 250 (E) 300
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Option B 200

fatema199
The correct option is B 200 The number of ways that it can be done = 5C2*5C3+5C3*5C2=200
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1st case 5C1*5C3= 50 2nd case 5C2*5C2=100 & 3rd case 5C1*

piediepie
1st case 5C1*5C3= 50 2nd case 5C2*5C2=100 & 3rd case 5C1*
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3rd case 5C3*5C1= 50 .combining all of them is 200.
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In the xy-plane, point A has coordinates (0,-p) and point B has coordinates (V2p-4,4-2p). What is the length of line segment AB?
(1)
12p - 2p? = 16
(2)
p > 3
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Consider an office of 45 employees, whose average age is 40 years. ‘x’ new employees join this office, whose average age is ‘y’ years. If it is known that×+y=50,thenwhatcanbethe maximum possible average age of all the employees now?
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Genius001
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User5890
Consider an office of 45 employees, whose average age is 40 years. ‘x’ new employees join this office, whose average age is ‘y’ years. If it is known that×+y=50,thenwhatcanbethe maximum possible average age of all the employees now?
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Let’s take the average age of all the guys, which is (a+b+c+..+d)/45=40. Another is (m+n+...+l)/x=y, where x+y=50 and y=50-x.
Average ages for everyone may be (a+b+c+..+d+m+n+..+l)/(45+x)=>; what is the maximum for that?

[-x2+50x+1800]/(45+x)=> (45*40+x*y)/(45*40+x*(50-x))/(45+x)=(45*40+x*(50-x)) To determine this function’s maximum value, we can utilize the derivative in this case. If we do, it would look something like this: [(-2x+50)*(45+x)-(-x26+50x+1800)]/(45+x)2=0 -x2-90x+450=0 x1=5 (about 4.8), x2=-95, for here we will take 5 since we need a greater value. When we use the previous function, [-x2+50x+1800]/(45+x), the result could be 40.5 or so.)
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gmatophobia
PS Question - July 10 How many positive divisors of 12,500 are squares of integers (aka perfect squares)? A) three B) four C) six D) eight E) twelve Source: GMATPrepNow | Difficulty: Hard
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C

gmatophobia
DS Question - July 10 If x and y are non-zero integers and |x| + |y| = 32, what is xy? (1) -4x – 12y = 0 (2) |x| – |y| = 16 Source: Manhattan | Difficulty: Hard
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A

PS Question 1 - July 13

Set T consists of 100 consecutive odd integers. If k is an integer, which of the following CANNOT equal the median of set T?

A) k² - k - 6
B) k² + 8k + 15
C) 4k² + 4k + 1
D) k³ - 4k² - k
E) 3k³ - 27k²

Source: GMATPrepNow | Difficulty: Hard

DS Question 1 - July 13

What is the value of xy?

(1) 3^x * 5^y = 75
(2) 3^[(x-1)(y-2)] = 1

Source: GMAT Club Tests | Difficulty: Hard
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gmatophobia
PS Question 1 - July 13 Set T consists of 100 consecutive odd integers. If k is an integer, which of the following CANNOT equal the median of set T? A) k² - k - 6 B) k² + 8k + 15 C) 4k² + 4k + 1 D) k³ - 4k² - k E) 3k³ - 27k² Source: GMATPrepNow | Difficulty: Hard
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median has to be even for the 100 consecutive odd integers. only Option C ensures that the result is odd and hence it can’t be the median of set T
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gmatophobia
DS Question 1 - July 13 What is the value of xy? (1) 3^x * 5^y = 75 (2) 3^[(x-1)(y-2)] = 1 Source: GMAT Club Tests | Difficulty: Hard
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A - option 1 is sufficient to answer the question

gmatophobia
PS Question 1 - July 13 Set T consists of 100 consecutive odd integers. If k is an integer, which of the following CANNOT equal the median of set T? A) k² - k - 6 B) k² + 8k + 15 C) 4k² + 4k + 1 D) k³ - 4k² - k E) 3k³ - 27k² Source: GMATPrepNow | Difficulty: Hard
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C
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200 children came to the park last sunday. All of the older children rode bicycles into the park and all of the younger children came on tricycles. 480 wheels rode into the park that day, all of them functioning on the children’s bicycles or tricycles. how many younger children came to the park last sunday? explain this math ans
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2*X+(200-X)*3=480
X=120
Therefore, that would be 120 Children and 80 younger children
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fatema199
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If a truck can carry 10 to 16 boxed refrigerators, then what is the least number of refrigerators that 4 trucks can carry? explain ans this math
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fatema199
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option- a) 40 b)52 c)48 d) 64
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fatema199
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its ans is 48. but i don’t know how this math calculated?
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its 40 in every sense as least number of boxes are 10

it doesn’t say 10 is included and next term should be 11 but 44 is not there in option so if we do 12*4 it comes ouut to be 48 which could be the answer
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fatema199
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a basketball team has won 15 games and lost 9. If these games represent 50/3 percent of the games to be played, then how many more games must the team win to average 75 percent for the season? explain this math.

my calculated ans was 93. it was right or wrong i confused
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