# Question #3a63b

Jun 18, 2016

$3 \left(2 a\right) - a = 15$

#### Explanation:

$\textcolor{b l u e}{\text{Assumption}}$

The question is meant to be:$\text{ } \left(a \times 2\right) 3 - a$

Mathematically this should be written as:$\text{ } 3 \left(2 a\right) - a$

but $3 \times 2 = 6$ giving

$6 a - a$

It is bad mathematical practise to do so but you can write $a \text{ as } 1 a$

$6 a - 1 a = 5 a$

But $a$ has the value of 3 so we have

$\textcolor{b r o w n}{5 a} \textcolor{b l u e}{\text{ "->" } 5 \times 3 = 15}$

So the answer is the solution b