iGCSE Mathematics (0580) - C1.11 Ratio and proportion- Exam Style Questions Paper 3- New Syllabus
▶️ Answer/Explanation
The difference in their ratio parts is $7 – 3 = 4$ parts.
We know these 4 parts equal $\$36$.
$1 \text{ part} = \frac{36}{4} = \$9$
The total number of parts is $3 + 7 = 10$ parts.
Total money = $10 \times 9 = \$90$
✅ Answer: $\$90$
▶️ Answer/Explanation
First, figure out the total amount of flour Tom needs by scaling up the recipe for $70$ cakes:
$225 \text{ g} \times (70 / 10) = 1575 \text{ g}$ of flour.
Next, determine how many $500 \text{ g}$ bags are required to get this amount:
$1575 \text{ g} / 500 \text{ g per bag} = 3.15$ bags.
Since Tom cannot buy a fraction of a bag, he must round up to the next whole number.
✅ Answer: $4$
$225 \text{ g} \times (70 / 10) = 1575 \text{ g}$ of flour.
Next, determine how many $500 \text{ g}$ bags are required to get this amount:
$1575 \text{ g} / 500 \text{ g per bag} = 3.15$ bags.
Since Tom cannot buy a fraction of a bag, he must round up to the next whole number.
✅ Answer: $4$