Standard Mathematics Primary 3 Fractions

Siti pours some orange juice for her friend. She pours □/20 of a full bottle, which is the same as 3/5 of the bottle. What is the missing numerator □?

A 6
B 12
C 15
D 4
Show Worked Solution

Worked Solution

Step 1: Find the multiplier from denominator to denominator. 5 × ? = 20 5 × 4 = 20, so the multiplier is 4. Step 2: Multiply the numerator by the same number. □ = 3 × 4 = 12 Step 3: Check: 3/5 = 12/20? 3/5 = 3 × 4 / 5 × 4 = 12/20 ✓ The missing numerator is 12.

Correct answer: 12

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