AlgebraEasyFuel remaining from a two-variable equation
Algebra practice question
The fuel f, in litres, left in a car's tank after it has driven d kilometres is given by f = 40 − 0.1d. How many litres are left after 100 kilometres?
Answer: 30
f = 40 − 0.1(100) = 40 − 10 = 30.
Common wrong answers
- If you answered 10
- 10 is the fuel used, not the fuel left.
- If you answered 50
- 50 adds instead of subtracting.
- If you answered 39.9
- 39.9 subtracts 0.1 once instead of 0.1 × 100.
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