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(6)The total cost of 6 books and 7 pens is 79 rupees and the total cost of 7 books and 5 pensis 77 rupeess. Find the cost of 1 book and 2 pens. |
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Answer» Let cost of one book=₹xLet cost of one pen=₹y 6x+7y=797x+5y=77 Multiplying first equation by 5 and second by 7,30x+35y=39549x+35y=539 Subtracting two equations,-19x=-144x= ₹ 7.58y=4.79 Therefore,cost of one book=₹ 7.58Let cost of two pens=₹2×4.79=₹9.58 |
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