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Introduction to Average

Chirag spent ...

Question

Chirag spent ₹112 for 8 pens and 9 erasers. If the cost of one pen is ₹10, then estimate the cost of one eraser.

A

₹1

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B

₹2

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C

₹3

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D

₹4

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Solution

The correct option is C ₹3
₹112 spend by chirag can be rounded off to ₹110
one pen costs = ₹10
Cost of 8 pens = ₹10 x 8
= ₹80
Cost of 9 erasers = ₹110 - ₹80
= ₹30
9 erasers can be rounded off to 10 erasers
So the estimated cost of one eraser = ₹30 ÷ 10
= ₹3

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