• If the sand is to be delivered by lorry, each one will carry 10 m³ of sand. How many lorry-loads will be needed?

The number of loads will be 10¹² m³/10 m³ load ^–1 = 10¹¹ loads.

• Now we know how much sand we need, we can order it. The builders’ merchant would like some sort of schedule, so let’s have one lorry-load every 10 minutes, day and night throughout the year. How many loads per year is this?

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