Question
What per cent of 1 h is 30 min?
✓
Answer
Let x% of 1 h is 30 min.
So, $\quad \frac{x}{100} \times 1 h=30 min$
$\therefore \frac{x}{100} \times 60 min=30 min \quad[\because 1 h=60 min]$
$\Rightarrow x=\frac{30 \times 100}{60}$
$\Rightarrow x=\frac{100}{2}=50 \%$
Hence, 50% of 1 h is 30 min.
So, $\quad \frac{x}{100} \times 1 h=30 min$
$\therefore \frac{x}{100} \times 60 min=30 min \quad[\because 1 h=60 min]$
$\Rightarrow x=\frac{30 \times 100}{60}$
$\Rightarrow x=\frac{100}{2}=50 \%$
Hence, 50% of 1 h is 30 min.
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