Question

You build and sell toy boxes. So far, you have built 15 toy boxes that you will sell for $60 each. How much money will you have if you build 20 more toy boxes and sell all of them?

Answer 1

15 plus 20 equals 35
35 times 60 equals 2100
they will make you $2100

Answer 2

Since you already have 15 boxes, and you want to build 20 more, you add the two numbers. 15+20=35.  Then, you multiply 35 by 60 since you are selling each for $60. 35x60=2100. So you will have $2100 dollars if you sell 35 boxes.