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Nan Hua 2025 P6 Maths Prelim — Paper 1 Booklet A Q10 Solution
Question
A book costs $\$b$ more than a pen. The total cost of a book and 3 pens is $\$20$. Find the cost of a pen.
- 1. $\frac{20 - b}{3}$
- 2. $\frac{20}{4} - b$
- 3. $20 - 3b$
- 4. $\frac{20 - b}{4}$
Answer: 4
Worked solution
- \text{Let cost of pen} = \$p
- \text{Book} = \$(p + b)
- (p + b) + 3p = 20
- 4p + b = 20
- p = \tfrac{20 - b}{4}
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