- A
- B3
- C
- D6
Step-by-Step Solution
Distance per litre = distance ÷ petrol = km. Multiplying the two gives , and dividing the wrong way round gives — always ask which quantity is being shared out.
Answer: D) 6
A car travels km on litre of petrol. How many kilometres does it travel on 1 litre?
Class 7Rational NumbersRational Numbers
Key idea: Operations on rationals
**Addition / subtraction**: same denominator → add/subtract numerators. Different denominator → bring to common denominator first.
**Multiplication**: (p/q) × (r/s) = (p×r)/(q×s). Sign rule from integers applies (same → +, different → −).
**Division**: multiply by the reciprocal. (p/q) ÷ (r/s) = (p/q) × (s/r), provided r ≠ 0.
Nothing new compared to fractions — just keep track of signs.
**Multiplication**: (p/q) × (r/s) = (p×r)/(q×s). Sign rule from integers applies (same → +, different → −).
**Division**: multiply by the reciprocal. (p/q) ÷ (r/s) = (p/q) × (s/r), provided r ≠ 0.
Nothing new compared to fractions — just keep track of signs.
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