Biju bought 3 pencils and 5 books for Rs. 85 while Kiran bought 7 pencils and 3 books for Rs. 77. If Romani wants to buy 5 pencils and 4 books, how much money would she have to spend?

Rs. 73

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Rs. 75

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Rs. 71

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Rs. 81

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None of the above

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Solution

The correct option is D Rs. 81
3x + 5y = 85 --- (1)
7x + 3y = 77 --- (2)
$\frac{(1) + (2)}{2}$ = 5x +4y = Rs 81

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Biju bought 3 pencils and 5 books for Rs. 85 while Kiran bought 7 pencils and 3 books for Rs. 77. If Romani wants to buy 5 pencils and 4 books, how much money would she have to spend?

The correct option is D Rs. 813x + 5y = 85 --- (1) 7x + 3y = 77 --- (2) (1)+(2)2 = 5x +4y = Rs 81

The correct option is D Rs. 81
3x + 5y = 85 --- (1)
7x + 3y = 77 --- (2)
$\frac{(1) + (2)}{2}$ = 5x +4y = Rs 81