if the compound ratio 7 : 5 and 8 : x is 84 : 60 find x
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7:5=8:x is 84:60
5x8/7x is 84:60
40/7x is 84:60
x=5.278
5x8/7x is 84:60
40/7x is 84:60
x=5.278
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