Question

Add 15 to a number then multiply the result by three

Answer 1

Answer: 3a+45

Step-by-step explanation: If your are asking this: (a+15)x3

Depending on what your number if then the answer changes, if you number (a) if 5 perhaps them you add it to the equation (5+15)x3)

I find it best to merely search on the web to see the answer.