Practicing Success
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CUET
General Test
Numerical Ability
Ratios
The third proportional to 81 and 27 is:
8
6
7
9
81 : 27 : x
⇒ The third proportional x,
⇒ 81x = 27 x 27
⇒ 81x = 729
⇒ x = 9.