a shopkeeper sold 75 pens and pencils for rs 4915 the selling price of each pen was rs 120 and that of a pencil was rs 25. find the number of pens sold
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let pencils be x
let pen be y
x+y=75 ...1
25x+120y=4915 ...2
divide by 5 (2)
5x+24y=983 ....3
multiply (1) by 5
5x+5y=375 ...4
subtract 3 &4
5x+24y=983-(5x+5y=375)
19y=608
32
let pen be y
x+y=75 ...1
25x+120y=4915 ...2
divide by 5 (2)
5x+24y=983 ....3
multiply (1) by 5
5x+5y=375 ...4
subtract 3 &4
5x+24y=983-(5x+5y=375)
19y=608
32
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