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Mathematics

Grade-7

Easy

Question

John reads $1 third$ of a book in 1 hour. The book he reads in $2 1 fifth$ hours is __________.

$\frac{11}{15}$
$\frac{11}{5}$
$\frac{11}{20}$
$\frac{1}{3}$

hint Hint:

Solve using the unitary method.

The correct answer is: $11 over 15$

STEP BY STEP SOLUTION
The part of the book read by John in 1 hour = $1 third$
So,
the part of the book read by him in $2 1 fifth$ hours = Part of book read in 1 hour $cross times$ $2 fraction numerator 1 over denominator 5 space end fraction h r s$
= $2 1 fifth space straight x space 1 third$
= $11 over 5 space cross times space 1 third space equals space 11 over 15$ .
He wilo read $11 over 15 space p a r t space o f space b o o k space i n space 2 1 fifth h r s.$

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