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Tough percentages problem,

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Tough percentages problem,

by mitaliisrani » Fri Sep 03, 2010 4:46 am
A test has 225 questions. Robin answered 60% of the first 110 questions correctly. What percent of the remaining questions should he answer correctly so that he gets 75% of the maximum mark in the test approximately?
A) 89%
B) 84%
C) 81%
D) 78%

OA is A
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by Rahul@gurome » Fri Sep 03, 2010 5:07 am
# of first 110 questions answered correctly = 60% of 110 = 66
Remaining questions = 115
75% of 225 = 168.75
x% of 115 + 66 = 168.75
1.15x = 102.75 which implies x is appr 89%

The correct answer is [spoiler](A)[/spoiler].
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