Question

in a test of 1 hour, subu spent 2/3 hours on writing answers and 1/4 hour on revising them.,how much time was left when he finished the test

Answer 1

Test=1 hour
He spend=2/3+1/4
Left=1-2/3+1/4
=1/12 hour or 5 minutes were left

Answer 2

Hey mate....
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Let , the time left when he finished the test be x.

Given,

In a test of 1 hour, subu spent 2/3 hours on writing answers and 1/4 hour on revising them.

So,

$1 - ( \frac{2}{3} + \frac{1}{4} ) = x \\ \\ = > 1 - \frac{11}{12} = x \\ \\ = > \frac{12 - 11}{12} = x \\ \\ = > \frac{1}{12} = x$

Therefore, Required time left =
$\frac{1}{12} \: hours$