Mr Tan's car uses 8 litres of petrol for every 100 km it travels on the expressway. He drives from Tampines to Sentosa, a distance of 175 km in total. How many litres of petrol does the car use for the whole trip?
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Worked Solution
Step 1: Find the per-km rate. Rate = 8 L ÷ 100 km = 0.08 L per km.
Step 2: Apply the rate to 175 km. Petrol used = 0.08 × 175.
Step 3: Compute. 0.08 × 175 = 8 × 175 ÷ 100 = 1400 ÷ 100 = 14 L.
Alternative method: write 175 as 1.75 × 100. Then petrol = 8 × 1.75 = 14 L.
Check (reverse): 14 ÷ 175 = 0.08 L per km ✓, and 0.08 × 100 = 8 L per 100 km ✓.
Final answer: 14 litres.
Answer: 14 L
Correct answer: 14 L
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