Question

you ask your friend to pick a whole number, you tell him to add 7 to the number then to multiply by 3. after evaluating the expression, your friend says the value is 57. describe how you can find the number your friend picked

Answer 1

divide by 3 and subtract 7 (answer is 12)

Explanation:

dividing by three is the opposite of multiplying and subtracting is the opposite of adding so you would undo the add and multiply and get the original number