5 books and 7 pens together cost rupees 79 7 books and 5 pens together cost Rs 77 find the difference of costs of book and pen
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Answered by
2
5 pens = 77
1 pen= 77/5 = 15 2/5 or 15.40
7 pens = 15.4 x 7= 107.8
5 books = 797- 107.8
= 689.2
thus 1 book= 137.84
so, diff. is 30.04 rupees
please mark brainliest
1 pen= 77/5 = 15 2/5 or 15.40
7 pens = 15.4 x 7= 107.8
5 books = 797- 107.8
= 689.2
thus 1 book= 137.84
so, diff. is 30.04 rupees
please mark brainliest
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