Fraction of a quantity: divide by the denominator, multiply by the numerator. Then solve the equation.

\(\dfrac{3}{4}\) of 16	=	\(16 \div 4 \times 3 = 4 \times 3 = 12\)
So the equation is: 12 = 2 x ?
? (the missing number)	=	12 \(\div\) 2 = 6