In Siti's marble collection, the ratio of red marbles to blue marbles is 3 : 5. What fraction of all the marbles are red?
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Worked Solution
Step 1: The ratio of red to blue is 3 : 5, meaning red = 3 parts, blue = 5 parts.\n
Step 2: Find the total number of parts: 3 + 5 = 8 parts.\n
Step 3: Red as a fraction of the whole = red parts ÷ total parts = 3/8.\nCheck: Blue would be 5/8, and 3/8 + 5/8 = 8/8 = 1 (whole). ✓
Answer: 3/8
Correct answer: 3/8
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