How many more of objects are coins ?

A doctor collected about 2500 of objects he retrieved from people's airway after they were swallowed. About 29/100 are pins how many is that ?

About 4/125 are buttons and 3/50 are coins .How many more of the objects are coins ?
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1 Answer

29/100 of 2500=29*2500/100=725 pins.

4/125*2500=80 buttons and 3/50*2500=150 coins so 70 more coins than buttons.

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