Question

5 books and 7 pens together cost 79 rupees where has 7 books and pens together cost 77 find the cost of one book and two pants​

Answer 1

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It is given that five pens and 7 pens cost 79 rupees.

So, let the number of books be x and the number of pens be y.

According to the question,

5x+7y=79------(1)

Similarly,

7x+5y=77-------(2)

multiplying (2) by 5, and (1) by 7,

35x+49=553------(3)

35x+25y=385-----(4)

Subtracting (4) from (3),

24y=168

y=7

Substituting this value in (1),

5x+49=79

5x=30

x=6

Hence, the cost of one book= 6 rupees

Two pens=2×7=14 rupees