A shopkeeper had some pens. A customer bought 10% of the pens, then another bought 20% of the remaining, and the last customer purchased 25% of the remaining pens.
If the shopkeeper is left with 270 pens in his shop, how many pens were there initially in his shop?
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If the shop keeper has 500 pens then 10% of 500 is 50 pens =10/100*500 =50 Then the left over pens are 450 (500-50) So the 20% of 450 pens is 90 pens =20/100*450 =90 After substracting 90 pens from 450 we are left with 360 pens , so 25%of 360 is 90 , as ... =25/100*360 =90 Then finally the shop keeper is left with 500 - 50 -90 -90 =270 pens Like this answer if you get any help or ask for another method Thanx
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NAGRANO KABRATH
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