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Which of the following is the closest approximation to
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27 Oct 2017, 01:51

73 is some number between 8^2 and 9^2. Since it is closer to 64, lets take its square root as 8. 239 is close to 225 which has a square root of 15. Hence lets take it as 15.

15x8 = 120

Square root of 7.2 is some number between 2 and 3 since 2^2 is 4 and 3^2 is 9. Assume it to be 2. Square root of 15.7 is some number slightly less than 4, since 4^2 = 16. Hence take it to be 4.

4+2 = 6

Therefore 120/6 = 20

Answer: C

gmatclubot

Which of the following is the closest approximation to &nbs
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27 Oct 2017, 01:51