Discussion
It takes 5 hours to mow a garden. In one hour, what per cent of the garden will be mowed?
Answer: C
20 per cent of the garden will be mowed in one hour. If the whole garden takes 5 hours, then in one hour 1/5 of the work is done, and \[\frac{1}{5} \times 100 = 20\] per cent. The options 15, 18 and 21 per cent would need the work to take about 6.7, 5.6 or 4.8 hours. Dividing 100 per cent by 5 hours gives the share per hour, 20 per cent. If it were 15, 18 or 21 per cent per hour, the garden would take about 6.67, 5.56 or 4.76 hours, and the question says it takes exactly five, so only 20 per cent fits.
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