Which number can be filled at a place of '?'

The correct answer is Option (1) → 16

In each circle, the number at the top is half the product of the two numbers below it.

• First circle: \(14\times12=168\), and \(168\div2=84\)

• Second circle: \(18\times9=162\), and \(162\div2=81\)

• Third circle: \(?\times11\div2=88\), so \(?\times11=176\) and \(?=16\)