During the summer holidays, Sarah earns pocket money by mowing the lawn. She can mow 6 lawns in 1 1/2 hour and clean a pool in one-sixth of an hour. How long does Sarah take to clean 10 pools and 10 lawns?
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Answer:
Step-by-step explanation:
11/2 / 6 = 11/12
cleaning a pool
: 60/6 = 10
10 lawns = 11/2 + 11/12 + 11/12 + 11/12 +11/12
= 66+11+11+11+11/ 12
= 110/12 = 55/6
cleaning 10 pools = 10 *10 = 100 = 1hr 40 min
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