Foundation Mathematics Primary 6 Ratio

2/5 of the marbles in a bag are red. The rest are blue. What is the ratio of red marbles to blue marbles?

A 2 : 3
B 2 : 5
C 3 : 2
D 3 : 5
Show Worked Solution

Worked Solution

Step 1: Red marbles = 2/5 of the total. Blue marbles = 1 − 2/5 = 3/5 of the total. Step 2: Red : Blue = 2/5 : 3/5 = 2 : 3 (multiply both sides by 5 to remove the fraction). Answer: Red : Blue = 2 : 3. Answer: 2 : 3

Correct answer: 2 : 3

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