A recipe for 8 people uses 3/4 of a cup of sugar. How much sugar is needed for 20 people?
Answer and explanation
Correct answer: D. 1 7/8 cups
- Step 1: The scale factor is 20 ÷ 8 = 2.5. Step 2. 3/4 × 2.5 = 15/8 = 1 7/8 cups. Answer: 1 7/8 cups. Why not the others: 1 1/2 cups: This uses a scale factor of 2 instead of 2.5. 2 1/4 cups: This uses a scale factor of 3 instead of 2.5. 1 1/8 cups: This uses a scale factor of 1.5 instead of 2.5.
Practise more Multi-step number problems.
Free questions with an explanation for every one, and full timed Independent School Entrance (ISEB Pre-Test and 11+ CEM style) mock tests.
More Multi-step number problems questions
- A cinema sells adult tickets at £9.50 and child tickets at £6.25. A family ticket for 2 adults and 2 children costs £28. What is the cheapes…
- Sound travels at about 340 m/s. A clap of thunder is heard 6 seconds after the lightning flash. How far away is the lightning, in kilometres…
- A school trip has 168 pupils and 12 staff. Each coach seats 52 people. What is the smallest number of coaches needed?
- Eve spends 2/5 of her money on a book, and then 1/3 of what is left on lunch. She has £12 left. How much money did she start with?
- A tap fills a bucket at 15 litres per minute. Each bucket holds 9 litres. How many seconds does it take to fill 5 buckets?
- A paint is mixed from blue and yellow in the ratio 2 : 3. A decorator uses 4.5 litres of blue. How much yellow does she use?