Question:A number, on subtracting 15 from it, reduces to its 80%. What is 40% of that number ?
A 60 B 45 C 30 D 90
+ AnswerC
+ Explanationx-15 =80100x⇒x-15 =45x⇒x-45x=15 ∴x5=15 orx=(15×5) =75. Now,40% of 75 =(40100×75) =30
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