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Red and blue paints mixed in the ratio 4...

Red and blue paints mixed in the ratio `4:` 3. Prove that the double of red paint should be added to make the ratio `4: 1`.

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Paint should be added is x `therefore(4+x): 3=4: 1` `4+x=12 therefore x=12-4=8` `(4+8): 3=4: 1` `12: 3=4: 1` That is 8 litr4es (double of 4`)` of red paint should be added to make the ratio `4: 1`.
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