Question

Multiply $81$ by the sum of $2$ and $3$.

Answer 1

The song means to add something by something which means 2+3 which is that equals to 5. So, 5 times 81 equals is 405 witch means the answer is 405$

Answer 2

Answer: 405

Steps:
Note, S = Sum

(2 + 3) * 81= S

Starts with the parenthesis.

2 + 3 = 5

5 * 81 = 405