Question 1192358
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Here is a non-standard method for solving this kind of problem.  Compare it to the standard solution shown by the other tutor and see if this method "works" for you.<br>
When we get past all the words in the problem, we see that essentially the problem is mixing some paint that is 2/5 yellow with paint that is all yellow to get paint that is 3/5 yellow.<br>
(1) Look at the three fractions of yellow on a number line -- 2/5, 3/5, and 1 (=5/5).
(2) Observe/calculate that 3/5 is 1/3 of the way from 2/5 to 1.
(3) That means 1/3 of the mixture needs to be the all yellow paint.
(4) The mixture is to be 5 liters, so the amount of all yellow paint in the mixture should be 1/3 of 5 liters, which is 5/3 liters.<br>
ANSWER: 5/3 liters, or 1 2/3 liters, of the original mixture should be thrown away and replaced with yellow paint to get the right shade of green.<br>