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Using this in eq. [1] ⇒ x = 2(3) – 1 = 5. Hence the original number is 10y + x = 10(3) + 5 = 30 + 5 = 35. 6. The total cost of 6 books and 7 pens is 79 rupees and the total cost of 7 books and 5 pens is 77 rupees. Find the …
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