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Question
What per cent of 1 km is 1000 metres?
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Solution
Let x% of 1 km be 1000 m.
Then, `x/100 xx 1` km = 1000 m
⇒ `x/100 xx 1000` m = 1000 m ...[∵ 1 km = 1000 m]
⇒ x × 10 = 1000
∴ x = 100%
Hence, 100% of 1 km is 1000 m.
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