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Is a + b > 0 ?
1. 7a - b > 0
2. b - 6a > 0
Thanks.
New Addition: These are PS questions but because I am not able to post a new topic, I am adding these questions to my existing post (DS Forum).
Please help me with the questions below. I am able to solve these but looking for faster way to do so. Can anybody please explain tricks for these questions? Thanks.
1) a couple decides to have 4 children. If they succeed in having 4 children and each child is equally likely to be a boy or a girl, what is the probability that they will have exactly 2 girls and 2 boys?
a. 3/8
b. 1/4
c. 3/16
d. 1/8
e. 1/16
2) A square wooden plaque has a square brass inlay in the center, leaving a wooden strip of uniform width around the brass square. If the ratio of the brass area to the wooden area is 25 to 39, whick of the following could be, in inches, the width of the wooden strip?
I. 1
II 3
III 4
I only
II only
I and II only
I and III only
I, II, and III
3) An ice-cream sundae consists of two ice-cream scoops, one flaver per scoop, and one topping. How many different types of sundaes can be prepared if four ice-cream flavors and two toppings are available?
a. 12
b. 14
c. 16
d. 18
e. 20
Thanks.
1. 7a - b > 0
2. b - 6a > 0
Thanks.
New Addition: These are PS questions but because I am not able to post a new topic, I am adding these questions to my existing post (DS Forum).
Please help me with the questions below. I am able to solve these but looking for faster way to do so. Can anybody please explain tricks for these questions? Thanks.
1) a couple decides to have 4 children. If they succeed in having 4 children and each child is equally likely to be a boy or a girl, what is the probability that they will have exactly 2 girls and 2 boys?
a. 3/8
b. 1/4
c. 3/16
d. 1/8
e. 1/16
2) A square wooden plaque has a square brass inlay in the center, leaving a wooden strip of uniform width around the brass square. If the ratio of the brass area to the wooden area is 25 to 39, whick of the following could be, in inches, the width of the wooden strip?
I. 1
II 3
III 4
I only
II only
I and II only
I and III only
I, II, and III
3) An ice-cream sundae consists of two ice-cream scoops, one flaver per scoop, and one topping. How many different types of sundaes can be prepared if four ice-cream flavors and two toppings are available?
a. 12
b. 14
c. 16
d. 18
e. 20
Thanks.
Archived Topic
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30 Oct 2009, 19:17
Kudos
Bookmarks
C
(A) and (B) by themselves does not gives enough info (use substitution)
Combining them together
6a<b<7a
Case 1 a is positive.
Above equation can be satisfied for b lying between 6a and 7a. So b is also positive.
Case 2 a is negative.
We cannot find b lying between 6a and 7a (a=1 -6<??<-7)
So only Case 1 remains, using which we can say a+b>0. Sufficient
(A) and (B) by themselves does not gives enough info (use substitution)
Combining them together
6a<b<7a
Case 1 a is positive.
Above equation can be satisfied for b lying between 6a and 7a. So b is also positive.
Case 2 a is negative.
We cannot find b lying between 6a and 7a (a=1 -6<??<-7)
So only Case 1 remains, using which we can say a+b>0. Sufficient
17 Nov 2009, 06:29
Kudos
Bookmarks
New Addition: These are PS questions but because I am not able to post a new topic, I am adding these questions to my existing post (DS Forum).
Please help me with the questions below. I am able to solve these but looking for faster way to do so. Can anybody please explain tricks for these questions? Thanks.
1) a couple decides to have 4 children. If they succeed in having 4 children and each child is equally likely to be a boy or a girl, what is the probability that they will have exactly 2 girls and 2 boys?
a. 3/8
b. 1/4
c. 3/16
d. 1/8
e. 1/16
2) A square wooden plaque has a square brass inlay in the center, leaving a wooden strip of uniform width around the brass square. If the ratio of the brass area to the wooden area is 25 to 39, whick of the following could be, in inches, the width of the wooden strip?
I. 1
II 3
III 4
I only
II only
I and II only
I and III only
I, II, and III
3) An ice-cream sundae consists of two ice-cream scoops, one flaver per scoop, and one topping. How many different types of sundaes can be prepared if four ice-cream flavors and two toppings are available?
a. 12
b. 14
c. 16
d. 18
e. 20
Thanks.
Please help me with the questions below. I am able to solve these but looking for faster way to do so. Can anybody please explain tricks for these questions? Thanks.
1) a couple decides to have 4 children. If they succeed in having 4 children and each child is equally likely to be a boy or a girl, what is the probability that they will have exactly 2 girls and 2 boys?
a. 3/8
b. 1/4
c. 3/16
d. 1/8
e. 1/16
2) A square wooden plaque has a square brass inlay in the center, leaving a wooden strip of uniform width around the brass square. If the ratio of the brass area to the wooden area is 25 to 39, whick of the following could be, in inches, the width of the wooden strip?
I. 1
II 3
III 4
I only
II only
I and II only
I and III only
I, II, and III
3) An ice-cream sundae consists of two ice-cream scoops, one flaver per scoop, and one topping. How many different types of sundaes can be prepared if four ice-cream flavors and two toppings are available?
a. 12
b. 14
c. 16
d. 18
e. 20
Thanks.
