Question

Two pounds of peaches cost $4.20. How much will five pounds cost?

Answer 1

2 pounds of peaches cost $4.20
5 pounds of peaches cost $??

5 x 4.20 / 2 = 10.5

answer

five pounds will cost $10.50

Answer 2

Set up multiplication of ratios so that they cancel out units that you do not need in your final answer...

5lb($4.20/2lb)=$10.50