The number of lawns that could be mowed in 27 hours is 45 lawns.
Ratios and proportions
A ratio is the comparison between two different quantities while proportion is an equality of two ratios.
- 9 hours to mow 15 lawns
- 27 hours to mow x lawns
Ratio of hours to lawns mowed
9 : 15 = 27 : x
9 / 15 = 27/x
9 × x = 15 × 27
9x = 405
x = 405 / 9
x = 45 lawns
Therefore,
rate of lawns mowed per hour = 45 lawns / 27 hours
= 5/3 lawns per hour
Learn more about ratios and proportions:
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