Ahmad, Siti, and Ravi receive pocket money in the ratio 5 : 3 : 2. Ahmad spends 2/5 of his share and Siti saves all of hers. Together, Ahmad's remaining money and Siti's money add up to $66. Find Ravi's share of the pocket money.
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Worked Solution
Step 1: Let Ahmad = 5k, Siti = 3k, Ravi = 2k.
Step 2: Ahmad spends 2/5 of his share → Ahmad keeps (3/5) × 5k = 3k.
Step 3: Siti saves all: Siti = 3k.
Step 4: Ahmad remaining + Siti = 3k + 3k = 6k = $66 → k = $11.
Step 5: Ravi's share = 2k = 2 × $11 = $22.
Correct answer: $22
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