Question

56:72::63:?
$81$
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Answer 1

56:72::63:?

=> 56/72 = 63/?

=> 56 × ? = 63 × 72

=> ? = 4536/56

=> ? = 81

Answer 2

Answer:

Step-by-step explanation:

The first two numbers' ratio is same as third and fourth if counted from left side.

(56/72)=(63/X)

(1/9)=(9/X)

X=81