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primary 6 | Maths
| Ratio
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Date Posted: 1 month ago
Views: 183
Let blue be 2u, red be 5u at first
After removing 1/3 blue, you get 2/3 of 2u, which is 4/3 u blue.
After adding 12 red marbles you get 5u+12 red
Blue to red at the end is 1:4
so 4/3 u * 4 = 5u + 12
16/3 u =5u +12
1/3 u = 12
1u = 36
At first there were 7u marbles = 36*7 = 252 marbles
After removing 1/3 blue, you get 2/3 of 2u, which is 4/3 u blue.
After adding 12 red marbles you get 5u+12 red
Blue to red at the end is 1:4
so 4/3 u * 4 = 5u + 12
16/3 u =5u +12
1/3 u = 12
1u = 36
At first there were 7u marbles = 36*7 = 252 marbles
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