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A river receives about 230 billion litres of water per day. How much water flows through that river each week?

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1.61 × 1012 litres

1.61 × 1011 litres

1.61 × 10 − 12 litres

1.61 × 10 − 11 litres

answer is A.

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Detailed Solution

Given that,
Water flows through a river each day

= 230

billion litres.
Since, 1 week = 7 days, therefore water flows through a river each day,

= 7 × 230 billion litres = 7 × 230000000000 litres = 1610000000000 litres

= 161 × 1010 litres .

= 161 × 100100 × 1010 litres

= 1.61 × 102 × 1010 litres

Apply the law of exponent

a m × a n = a m + n .

Therefore the water flows through a river each day

= 1.61 × 1012 litres

Thus, the water flows through a river each day

= 1.61 × 1012 litres .

Hence option (1) is correct.

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