The price of the 18 pens and 33 pencils is Rs 282. What will be the price of 30 pens a d 55 pencils?
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let the price of 1 pen be x
the price of 1 pencil be y
as,
18x +33y=282
3(6x +11y) =282
6x+11y=282/3
6x +11y=94 _(1)
multiplying (1) with 5
5(6x+11y) =5x94
30x+55y=470
thus, price of 30pens and 55 pencils is R's 470
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