Question

A number is doubled and $9$ is added. If the result is tripled it becomes $75$. What is that number?

• A. $3.5$
• B. $6$
• C. $8$
• D. $7$

Answer 1

The correct option is C $8$

Let $x=$ the number
So according to given conditions,
$3(2x+9)=75$
$\Rightarrow 6x+27=75$
$\Rightarrow 6x=75-27$
$\Rightarrow 6x=48$
$\Rightarrow x=\frac{48}{6}$
$\Rightarrow x=8$

Hence. the number is $8$.