Discussion of Question with ID = 021 under Ratio-and-Proportion

This is the discussion forum for this question. If you find any mistakes in the solution, or if you have a better solution, then this is the right place to discuss. A healthy discussion helps all of us, so you are requested to be polite and soft, even if you disagree with the views of others. The question and its current solution has also been given on this page.

Advertisement

Question

If 121, x, x and 64 are in proportion, then what is x?

A

88.

B

92.

C

84.

D

96.

Soln.
Ans: a

We have 121 : x :: x : 64, so 121 × 64 = x × x, which gives x = 11 × 8 = 88.

Comments and Discussion