Question

The total cost of 12 pens and 3 pencils is equal to Rs. 100. Also, the cost of 1 pencil is Rs. 6 less than the cost of 1 pen. What will be the cost of 8 pens and 9 pencils?

• A. 90
• B. 82
• C. 75
• D. 72
• E. None of these

Answer 1

The correct option is B

82

12(x+6)+3x = 100, x $\approx$ 2. Thus, 8 pens and 9 pencils = 9x+8(x+6) $\approx$ 82