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An archer’s score is calculated by the formula , where b is

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GMAT Club Legend
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Joined: 07 Jun 2014
Posts: 4749
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
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An archer’s score is calculated by the formula , where b is [#permalink] New post 27 Jul 2018, 07:10
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Question Stats:

60% (00:46) correct 40% (02:41) wrong based on 5 sessions
An archer’s score is calculated by the formula \(\frac{50b-10a}{10+s}\), where b is the number of bull’s-eyes hit, a is the total number of arrows shot, and s is the time in seconds it took the archer to shoot. By how many points would an archer who took 10 seconds to shoot 10 arrows and hit all bull’s-eyes beat an archer who shot twice as many arrows and hit half as many bull’s-eyes in 15 seconds?

(A) 2
(B) 7
(C) 10
(D) 18
(E) 20
[Reveal] Spoiler: OA

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GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jun 2014
Posts: 4749
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 93

Kudos [?]: 1656 [0], given: 396

CAT Tests
Re: An archer’s score is calculated by the formula , where b is [#permalink] New post 12 Aug 2018, 05:25
Expert's post
Explanation

Calculate each of the archer’s scores by plugging in the appropriate values for b, a, and s.

For the first archer, b = a = s = 10 and the score is \(\frac{50 \times 10 -10 \times 10}{10+10}=\frac{400}{20}=20\).

For the second archer, b = half of 10 = 5, a = twice as many as 10 = 20, and s = 15.

The score for the second archer is \(\frac{50 \times 5 -10 \times 20}{10+15}=\frac{50}{25}=2\). The difference in scores is 20 – 2 = 18.
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Sandy
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Re: An archer’s score is calculated by the formula , where b is   [#permalink] 12 Aug 2018, 05:25
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An archer’s score is calculated by the formula , where b is

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