I know the model answer is correct. But I’m trying to learn through ratio. Can

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primary 6 | Maths | Ratio
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primary 6 Maths Ratio Singapore

I know the model answer is correct. But I’m trying to learn through ratio. Can you help me to see what went wrong in ratio working that I ended up getting wrong answer compared to model answer?

Date Posted: 1 month ago

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This sum is an example of internal transfer. When there is internal transfer, total REMAINS THE SAME. So your before ratio is 3:5 and after ratio is 4:5. Total before is 8 units and total after is 9. Make them the same into 72 units. Multiply 3:5 by 9 thruout and multiply 4:5 by 8 thruout. New b4 ratio is 27:45 and new after ratio is 32:40.
5 units= 2500 g
1 unit= 500g
72 units= 500 x 72= 36000 g

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