Question

The cost of 7 pens and 3 pencils is ` 155 and the cost of 3 pens and 7 pencils is ` 95.

Find the cost of 3 pens and 5 pencils
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Answer 1

Step-by-step explanation:

x=20

y=5

3x20+5x5=85

this is the answer

Answer 2

let pen = 20 and pencil= 5

pen=x, pencil=y

7x+3y=155

7(20)+3(5)=155

140+15=155

155=155

hence proved that valur are right

now

3x+5y=?

3(20)+5(5)

60+25=85