iStarSign inMath 8 · Unit 12: Ratio and proportion · Cambridge Lower Secondary Maths Stage 8
12.3 Ratio and direct proportion
15 questions · e.g. 5 m of cable costs $12. How much for 8 m?
Questions
1. 5 m of cable costs $12. How much for 8 m?
Check2. The graph of direct proportion is a straight line that …
Check3. 6 eggs make 15 pancakes. How many eggs for 25 pancakes?
Check4. Is a taxi fare of $3 + $2 per km in direct proportion to distance?
Check5. A car uses 8 litres per 100 km. How much for 350 km?
Check6. y is proportional to x. y = 12 when x = 3. Find y when x = 7.
Check7. $1 = 0.8 euros. How many euros for $45?
Check8. 0.8 euros = $1. How many dollars is 20 euros?
Check9. A recipe for 4 uses 300 ml milk. How much for 10 people?
Check10. Which pair is in direct proportion?
- number of pencils and their total cost
- number of workers and time to finish
- temperature and time of day
- age and height
11. 3 kg of rice costs $4.50. Cost of 5 kg?
Check12. Speed constant: 150 km in 2 h. Distance in 5 h?
Check13. y ∝ x. When x doubles, y …
Check14. 12 workers earn $1800 total for a day. What do 20 workers earn at the same rate?
Check15. A map: 4 cm represents 10 km. What does 14 cm represent?
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