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David says to robert "if you guve me 15 of your tiles, [#permalink]

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18 Apr 2013, 00:05

David says to robert "if you guve me 15 of your tiles, i will have three times the number of tiles left with you robert replies if you give me 15 of your tiles i will have the same no of tiles left with you find the no of tiles of robert

a.75 b.60 c.45 d.30 e.25

Last edited by Zarrolou on 18 Apr 2013, 02:49, edited 1 time in total.

students of class are made to stand in row if one student is [#permalink]

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18 Apr 2013, 00:14

students of class are made to stand in row if one student is extra in a row there would be 2 rows less if one student is less in row there would be 3 rows more find the no of student

Re: 4men and 6 boys can finish a piece of work in 20 days while [#permalink]

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18 Apr 2013, 01:00

M = rate of work of men b = rate of work of boys

\((4M+6B)*20 days= 1 job\) \((3M+4B)*28 = 1 job\)

\(80M+120B=1\) \(84M+112B=1\) so dome math...

\(M=\frac{1}{140}\) \(B=\frac{1}{280}\) those are the rate of work (each hour).

\(7 boys = 7*\frac{1}{128}=\frac{7}{128}\) each hour To complete one job 1 \(job = time*\frac{7}{280}\) now this time is \(\frac{280}{7}\) hour that is none of your answers If the question were about men \(7 men = 7*\frac{1}{140}=\frac{7}{140}\) To complete one job 1 \(job = time*\frac{7}{140}\) now this time is \(\frac{140}{7}\) = 20 A
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Re: students of class are made to stand in row if one student is [#permalink]

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18 Apr 2013, 01:01

IMO C lets put that in equation. No. of students in one row=x No. of rows=y Total students=xy. 1st equation: (x+1)(y-2)=xy i.e. xy-2x+y-2 =xy i.e. -2x+y=2 2nd Equation (x-1)(y+3)=xy i.e. xy+3x-y-3 =xy i.e. 3x-y=3

adding 1st and second equation we get x=5 putting x=5 in any of the equation we get y=12

so total number of Students should be xy = 5*12 = 60

R u sure OA is D?
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Re: David says to robert "if you guve me 15 of your tiles, [#permalink]

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18 Apr 2013, 01:37

robert has 45 tiles.. agree with zar
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students of class are made to stand in row if one student is extra in a row there would be 2 rows less if one student is less in row there would be 3 rows more find the no of student

a.120 b.90 c.60 d.30 e.cant find

Think of the students standing in a matrix of rows and columns.

There are r rows and c columns. So there are a total of rc students.

Algebra approach:

Now if there is 1 student extra in each row i.e. there is one column extra, no of rows will be r-2 rows. If there is 1 student less in each row, i.e. there is one column less, no of rows will be r+3 rows.

(r - 2)(c + 1) = rc (r + 3)(c - 1) = rc

r - 2c = 2 -r + 3c = 3

c = 5 r = 12

Total number of students = 5*12 = 60
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There are two buses. If 10 passenger are sent from the first bus to second bus, passenger in both will be equal. If 20 passenger from 2nd bus are sent to 1st bus, the number of passenger in first will be twice the number of passenger of 2nd Find total passenger

a.180 b.500 c.600 d.300 e100

Last edited by Zarrolou on 19 Apr 2013, 12:04, edited 3 times in total.

.the area of rectangle increase by 200 sqmtr if lenghth is i [#permalink]

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19 Apr 2013, 11:53

5.the area of rectangle increase by 200 sqmtr if lenghth is increse by 8m and breadth by 3m the area incre by 225sq m if lenght is incr by 3 m and bradth by 8m find perimeter a.74m b.60m c.56m d.48m e.44m

the charges for a 5 day trip by tourisim bus for one full an [#permalink]

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19 Apr 2013, 11:55

6.the charges for a 5 day trip by tourisim bus for one full and half ticket is 1440 iccluding of boarding charges which are same for a full as well as a half ticket the charges for the same trip for 2 full and one half ticket the charges are 2220the fare for half ticket is 75% of the full ticket find the difference betwn the fare and boarding charges for one full ticket a.480 b.360 c.300 d.240 e.180

After covering a distance of 30 miles with a uniform speed a [#permalink]

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19 Apr 2013, 11:59

After covering a distance of 30 miles with a uniform speed, a train engine develops a defect and consequently its speed is reduced to 4/5th of its original speed. In result the train reaching its destination late by 3/4 hrs. Had it happened after covering 18 miles more the train would have reached its destination 9 mins earlier. Find the distance of journey

a.75 miles b.90 miles c.105 miles d.120 miles e.135 miles

Last edited by Zarrolou on 19 Apr 2013, 14:53, edited 1 time in total.

Albert invested a some amount at rate of 3% per quaterly sim [#permalink]

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19 Apr 2013, 12:01

Albert invested a some amount at rate of 3% per quaterly simple interest and other amount at the rate of 7.5% half yearly simple interest. he received 1500$ as interest for a year. if he had interchanged the amount invested he would have received 78$ more as interest for the year. Find the smallest investment

a.7062.5$ b.5762.5$ c.7562.5$ d.5002.0$ e.7002.0$

Last edited by Zarrolou on 19 Apr 2013, 13:13, edited 1 time in total.

A man sold a strawberry juice can and pineapple juice can fo [#permalink]

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19 Apr 2013, 12:03

A man sold a strawberry juice can and pineapple juice can for 760$ therby making profit of 25%on strawberry juice can and 10% on pineapple juice can by selling for 767.50$ he would have realized a profit of 10% on strawbeery can and 25% on pineapple can Find the cost price of pineapple juice can

a.175$ b.210$ c.240$ d.300$ e.350$

Last edited by Zarrolou on 19 Apr 2013, 12:56, edited 1 time in total.

A child on a controlled diet is fed 300 ounce of a mixture [#permalink]

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19 Apr 2013, 12:04

A child on a controlled diet is fed 300 ounce of a mixture of two foods a and b food a contains 10% protein and food b contains 15% protein if child diet contains exactly 38 ounce of protein daily. How many ounce of food a are in the mixture?

a.100 b.140 c.150 d.160 e.200

Last edited by Zarrolou on 19 Apr 2013, 12:39, edited 2 times in total.

.A train covered a certain distance at uniform speed [#permalink]

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19 Apr 2013, 12:04

11.A train covered a certain distance at uniform speed if train would have been 6miles/hour faster it would have taken 4 hrs less than the scheduled time and if the train were slower by 6 miles/hour it would have taken 6 hrs more than the scheduled time find the distance in miles of journey a.840 b.780 c.720 d.680 e.630

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.A train covered a certain distance at uniform speed
[#permalink]
19 Apr 2013, 12:04

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