Evaluate the following expression.
[ 7+(15 -3)÷6] x 3

PEMDAS

P - PARENTHESIS
E - EXPONENTS
M - MULTIPLICATION
D - DIVISION
A - ADDITION
S - SUBTRACTION

So we do that from left to right:



First we do parenthesis:



Now we have to take care of the next parenthesis. Inside of it is addition and division happening. So we have to do the division first:



Now we do the addition:



Now there is only one thing left: Multiplication



Your final answer is

The answer would be (c)