Siti is baking a pandan cake. She starts with 1 1/2 kg of flour. She uses 2/3 kg for the batter and 1/4 kg for the icing. How many kilograms of flour does Siti have left?
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Worked Solution
Step 1: Find total flour used.
2/3 + 1/4
LCD of 3 and 4 = 12
2/3 = 8/12 and 1/4 = 3/12
8/12 + 3/12 = 11/12 kg used
Step 2: Convert starting amount to twelfths.
1 1/2 = 3/2 = 18/12
Step 3: Subtract total used from starting amount.
18/12 - 11/12 = 7/12 kg
Final Answer: 7/12 kg
Correct answer: 7/12
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