Question

If 20 wall paintings can be done in 4 weeks how much time does it take to prepare 80 wall paintings using unit rate form?

Answer 1

Simplest way would be to find out how many painting more it would be 80 from 20. It is four times more drawings. Now since  you know it is 4x more then you can simply multiply 4 time 4 (4*4) because it would be the weeks it takes him by the times it would be. It would be 16 weeks in total.