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3/5 of the 8kg flour is not the same as 3/5 kg.
Mass of flour used to bake cupcakes
= 3/5 × 8 kg
= 24/5 kg
= 4 4/5 kg
= 4 12/15 kg
Mass of flour used to bake biscuits = 1/3 kg = 5/15 kg
Mass of flour left = 8kg - 4 12/15 kg - 5/15 kg
= 3 3/15 kg - 5/15 kg
= 2 18/15 kg - 5/15 kg
= 2 13/15 kg
Mass of flour used to bake cupcakes
= 3/5 × 8 kg
= 24/5 kg
= 4 4/5 kg
= 4 12/15 kg
Mass of flour used to bake biscuits = 1/3 kg = 5/15 kg
Mass of flour left = 8kg - 4 12/15 kg - 5/15 kg
= 3 3/15 kg - 5/15 kg
= 2 18/15 kg - 5/15 kg
= 2 13/15 kg
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