given that 7/9 of a mass A is the same as 5/12 of a mass B, find the ration of mass A to mass B

given that 7/9 of a mass A is the same as 5/12 of a mass B, find the ration of mass A to mass B
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start: (7/9)a=(5/12)b

a=(9/7)*(5/12)b

a=(45/84)b

  =(15/28)b
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