Aini, Bala and Chen share a kopitiam bill in the ratio $2 : 3 : 4$. Bala pays $\$18$. What is the TOTAL amount of the bill?
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Worked Solution
Step 1: The bill is divided in the ratio $2 : 3 : 4$, so the total number of units is $2 + 3 + 4 = 9$.\n
Step 2: Bala's share is the middle term, which corresponds to $3$ units. Bala paid $\$18$, so $3$ units = $\$18$.\n
Step 3: Find the value of $1$ unit: $\$18 \div 3 = \$6$.\n
Step 4: The total bill is $9$ units, so total = $9 \times \$6 = \$54$.\nCheck: Aini pays $2 \times \$6 = \$12$, Bala pays $3 \times \$6 = \$18$, Chen pays $4 \times \$6 = \$24$. Sum = $\$12 + \$18 + \$24 = \$54$. ✓
Answer: $54
Correct answer: $54
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