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20/5=4 4 is one fifth of 20
3.2 x 4 = 12.8
four fifth of 12 =9.6 To work it out you have to divide 12 by five which is the denominator and then you will get the answer 2.4 then multiply 4 by 2.4 and the answer will equal to 9.6
Divide 45 by 5 (giving you 9), then multiply that by 2 to get the answer 18.