Mei Ling mixes red paint and blue paint in the ratio 3 : 5. She uses 18 mL of red paint. How many millilitres of blue paint does she need?
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Worked Solution
Step 1: Find the scale factor.
Red ratio part = 3. Mei Ling uses 18 mL of red.
Scale factor = 18 ÷ 3 = 6
Step 2: Find the amount of blue paint.
Blue ratio part = 5.
Blue paint = 5 × 6 = 30 mL
Answer: 30 mL
Correct answer: 30 mL
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