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irspow
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
choixongdong
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