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प्रश्न
What per cent of 1 hour is 30 minutes?
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उत्तर
Let x% of 1 h be 30 min.
Then, `x/100 xx 1 h` = 30 min
⇒ `x/100 xx 60` min = 30 min ...[∵ 1 h = 60 min]
⇒ `x = (30 xx 100)/60`
∴ x = 50%
Hence, 50% of 1 h is 30 min.
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