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The radius of the two circular fields is in the ratio 3: 5 the area of the first field is what percent less than the area of the second?

50%
60%
40%
64%
Explanation:

r = 3 $\pi r^2$ = 9

r = 5 $\pi r^2$ = 25

25 $\pi$ - 16 $\pi$

100 ---- ? => 64%

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