IBPS Government Jobs Exams Numerical Ability Arithmetic

Meena has some money. She can buy 40 books or 90 pens with it. She keeps 20% of the money for food and with the remaining buys 36 pens and some books. Find the number of books she buys.
A) 12 B) 15 C) 14 D) 16 E) 18

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Answer-D)16

let cost be 100rs
40B=100 => B=2.5rs
90P=100 => P=10/9rs

20% ie 20rs spent on food
Remaining =100-20=80rs

x no of books + 36 pens = 80
x * 2.5 + 36*10/9 =80
2.5x=80-40
x=40/2.5=16
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