70 rupees we will get 100 pens then 100 rupees how many pens
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Cost of 100 pens=Rs.70
Cost of 1pen= 70/100
=Rs. 0.7
No.of pens that can be bought for Rs. 100=
100/Cost of 1pen
i.e.,100/0.7
=142.85
= 143 pens(approx)
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