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A car covers 210 km on 14 litres of petrol. How far can it travel on 22 litres at the same rate?

Class 7Comparing QuantitiesComparing Quantities
  • A218 km
  • B300 km
  • C133.6 km
  • D330 km

Step-by-Step Solution

Find the distance for ONE litre first: km per litre. For 22 litres, distance = km. 133.6 km comes from multiplying and dividing the wrong way round — always ask whether the answer should be bigger or smaller than 210 km before you divide. 218 km adds the 8 extra litres on as kilometres.
Answer: D) 330 km

Key idea: Three forms of the same number

Fractions, decimals, and percentages are three notations for the same idea. Convert freely:

- **Fraction → percentage**: multiply by 100. .
- **Percentage → fraction**: divide by 100 and simplify. .
- **Decimal → percentage**: shift two places right. 0.34 = 34%.
- **Percentage → decimal**: shift two places left. 8% = 0.08.

With practice, this becomes automatic and you can move between forms without thinking.

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