The average of X1, X2 and X3 is 14. Twice the sum of X2 and X3 is 30. What is the value of X1?

Answer: Option D

$$\begin{array}{rl}& {\text{X}}_1+{\text{X}}_2+{\text{X}}_3\\ & =\left(14\times 3\right)\\ & =42\end{array}$$
According to the question,
$$\begin{array}{rl}& 2\left({\text{X}}_2+{\text{X}}_3\right)=30\\ & \Rightarrow {\text{X}}_2+{\text{X}}_3=15\\ & \therefore {\text{X}}_1=\left(42-15\right)=27\end{array}$$