Question

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?

• A. Rs. 73
• B. Rs. 75
• C. Rs. 71
• D. Rs. 81
• E. None of the above

Answer 1

The correct option is D Rs. 81

3x + 5y = 85 --- (1)
7x + 3y = 77 --- (2)
$\frac{\left(1\right)+\left(2\right)}{2}$ = 5x +4y = Rs 81