25-10-2016
Mathematics

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Kate gave 5/6 of her CD's to Sue. Sue gave 7/8 of these to Joan. Joan gave 3/5 of these to Ann. If Ann recieved 70 CDs, how many did Kate have originally?

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25-10-2016

70=3/5
times 5/3
350/3
this is 7/8
350/3=7/8
times 8/7 both sides
400/3

that is 5/6
400/3=5/6 of total
times 6/5 both sides
800/5=160

kate had 160 originally

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