5 books and 7 pens together cost ₹79 and 7 books and 5 pens together cost ₹77 find total cost of 1 book and 2 pens
Answers
Answered by
2
Say, the cost of 1 book is = x rs.
and, cost of one pen is = y rs.
According to the question,
5x + 7y = 79
or, 5x x 7 + 7y x 7 = 79 x 7
or, 35x + 49y = 553........................(1)
Anew,
7x + 5y = 77
or, 7x x 5 + 5y x 5 = 77 x 5
or. 35x + 25y = 385......................(2)
(1) - (2)
or, 24y = 168
or, y = 7
so, 5x + 7 x 7 = 79
or, 5x = 30
or, x = 6
So, total cost of one book and one pen is-
= (x+y)
= 7 + 6 Rs.
= 13 Rs.
Hope this answer helped :)
Answered by
3
Answer:
Cost of one book is Rs.6 and cost of 2 pens is Rs. 14.
So total cost is 6+14=20
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