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Question
About 230 billion litres of water flows through a river each day. How many litres of water flows through that river in a week? How many litres of water flows through the river in an year? Write your answer in standard notation.
Solution
Water flows through a river in each day = 230000000000 or 230 billion
Water flows through the river in a week = 7 × 230000000000 ...[∵ 1 week = 7 days]
= 1610000000000
= 1610 billion
= 1.61 × 1012 L
Water flows through the river in a year = 230000000000 × 365 ...[∵ 1 yr = 365 days]
= 83950000000000
= 8.395 × 1013 L
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