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There are two circle-shaped pizzas. The diameter of the smal

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by Max@Math Revolution » Thu Jun 16, 2016 7:36 pm
There are two circle-shaped pizzas. The diameter of the smaller pizza is 10 and the larger pizza's area is 2 times of the smaller pizza's area, what is the diameter of the larger pizza, in whole number?
A. 12
B. 15
C. 18
D. 20
E. 25

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by Max@Math Revolution » Sun Jun 19, 2016 4:48 pm
Since √(proportion of area) = proportion of length. If the proportion of area is 2, then we have √2. Hence, the proportion of length becomes approximately 1.5. So, from 10*1.5=15. Thus, the correct answer is B.
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