A shop sells notebooks for Rs 90 and pens for Rs 24. A customer buys 15 items for Rs 690. How many notebooks were bought?

Question: A shop sells notebooks for Rs 90 and pens for Rs 24. A customer buys 15 items for Rs 690. How many notebooks were bought?

1. 6
2. 5
3. 4
4. 7

Correct Answer: B — 5

Explanation: Let notebooks be x and pens be total items − x; equate the purchase cost.
Solve 90x + 24(15 − x) = 690; notebooks x = 5.