Brian Chiong's answer to Athena's Primary 6 Maths Ratio Singapore question.
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For this question, comparing the first two ratios given I can draw a model to see how many units are taken away when Darren or muthu pays for the gift.
By comparing I can see that when I take away 8 units I can fit the ratios given so the cost of the gift would be 8 units and from there we can solve the question.
If you wish to double check this you can draw 11 squares to represent Hafiz and then take away 8 units. He will be left with 3 units and the ratio from the model will be 12:9:3 which simplifies to 4:3:1 as given in the question. Hope this helps!
By comparing I can see that when I take away 8 units I can fit the ratios given so the cost of the gift would be 8 units and from there we can solve the question.
If you wish to double check this you can draw 11 squares to represent Hafiz and then take away 8 units. He will be left with 3 units and the ratio from the model will be 12:9:3 which simplifies to 4:3:1 as given in the question. Hope this helps!
Date Posted:
3 years ago
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