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Question

The ratio of the mass of flour to the mass of sugar was 4:5. If the mass of flour increased by 5kg and the mass of sugar decreased by 1kg,they would have the same mass. What was the mass of flour at first?
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Answer

4u + 5 = 5u + 1

4u + 4 = 5u

1u -> 4 kg

4u + 5u = 9u

9u -> 4 × 9 = 36 kg //

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