Question

Average cost of 7 pens and 5 books is 19 Rs. The average cost of 9 pens and 11 books 23.8 Rs. What’s the total cost of 8 books and 8 pens?

• A. 256
• B. 440
• C. 352
• D. 532

Answer 1

The correct option is C 352

Total cost of 7 pens and 5 books $=12\times 19=228$ ---(1)
Total cost of 9 pens and 11 books $=20\times 23.8=476$ ---(2)
Adding (1) and (2), we get Total cost of 16 pens and 16 books = 228+476 = 704
Therefore, total cost of 8 books and 8 pens $=\frac{704}{2}=352$