AlgebraMediumTwo quantities from a ratio and a difference
Algebra practice question
In a car park there are four times as many cars as vans, and there are 9 more cars than vans. How many vehicles are in the car park in total?
Answer: 15
Let v be the number of vans: cars = 4v and 4v − v = 9, so v = 3 and cars = 12. Total = 15.
Common wrong answers
- If you answered 3
- 3 is the number of vans.
- If you answered 12
- 12 is the number of cars.
- If you answered 45
- 45 comes from taking 9 as the number of vans (9 + 36).
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