Question : The ratio of the length of a school ground to its width is 5 : 2, if the width is 40 m then the length is:
Option 1: 200 m
Option 2: 100 m
Option 3: 50 m
Option 4: 80 m
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Correct Answer: 100 m
Solution : Let the length of the ground be $l$ m. Width = $w$ = 40 m (given) $\frac{l}{w} = \frac{5}{2}$ ⇒ $\frac{l}{40} = \frac{5}{2}$ ⇒ $l = \frac{5\times 40}{2}$ $\therefore l = 100 $ m Hence, the correct answer is 100 m.
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