nine items can be produced in 15 minutes. How many items can be produced in 35 minutes

Question

nine items can be produced in 15 minutes. How many items can be produced in 35 minutes

Answer 1

Create a ratio of items-per-minute:

     (9 items) / (15 minutes) = (x items) / (35 minutes)

 

Cross-multiply:

   15x = 9*35

      x = 21

21 items may be created in 35 minutes.