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Ann and Bob planted trees on Friday. What is the ratio of the number

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Ann and Bob planted trees on Friday. What is the ratio of the number  [#permalink]

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New post 23 Jul 2018, 02:02
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Ann and Bob planted trees on Friday. What is the ratio of the number of trees that Bob planted to the number of trees that Ann planted?

(1) Ann planted 20 trees more than Bob planted.

(2) Ann planted 10 percent more trees than Bob planted.

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Re: Ann and Bob planted trees on Friday. What is the ratio of the number  [#permalink]

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New post 23 Jul 2018, 02:09
Bunuel wrote:
Ann and Bob planted trees on Friday. What is the ratio of the number of trees that Bob planted to the number of trees that Ann planted?

(1) Ann planted 20 trees more than Bob planted.

(2) Ann planted 10 percent more trees than Bob planted.


(1) Ann planted 20 trees more than Bob planted.
clearly insufficient !!

(2) Ann planted 10 percent more trees than Bob planted.
if Bob planted x trees
Ann planted 1.1x
ratio=10/11
sufficient
B
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Re: Ann and Bob planted trees on Friday. What is the ratio of the number  [#permalink]

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New post 23 Jul 2018, 02:16
Bunuel wrote:
Ann and Bob planted trees on Friday. What is the ratio of the number of trees that Bob planted to the number of trees that Ann planted?

(1) Ann planted 20 trees more than Bob planted.

(2) Ann planted 10 percent more trees than Bob planted.


Let A be the number of trees planted by Ann and B the number of trees by Bob

1. Ann planted 20 trees more than Bob planted.
Case 1: B = 20, A = 40 Ratio(B:A) = 1:2
Case 2: B = 10, A = 30 Ratio(B:A) = 1:3 (Insufficient)

1. Ann planted 10 percent more trees than Bob planted.
A = 1.1B. The ratio of the number of trees will be 10:11(B:1.1B) (Sufficient - Option B)
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Re: Ann and Bob planted trees on Friday. What is the ratio of the number  [#permalink]

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New post 23 Jul 2018, 07:10
Bunuel wrote:
Ann and Bob planted trees on Friday. What is the ratio of the number of trees that Bob planted to the number of trees that Ann planted?.


+1 for B

(1) Ann planted 20 trees more than Bob planted.
Multiple values for number of trees planted by each.
Insufficient

(2) Ann planted 10 percent more trees than Bob planted
A = 1.1*B
A / B = 1.1 / 1
A / B = 11 / 10
Sufficient

Hence, B.
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Re: Ann and Bob planted trees on Friday. What is the ratio of the number &nbs [#permalink] 23 Jul 2018, 07:10
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