Problema Solution
There are 150 marbles in a bucket. Of the 150, 80% have swirled colors, and 20% are solid. How many swirled must be removed so 75% of the remaining marbles are swirled?
Answer provided by our tutors
80% of 150 is 0.80*150 = 120 swirled color marbles.
Let 'x' represent the number of swirled marbles that needs to be removed.
(120 - x)/(150 - x) = 0.75
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click here to see the equation solved for x
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x = 30 swirled marbles
30 swirled marbles needs to be removed.