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There are 130 red, blue and green marbles in a bag. The ratio of red to blue to green is 5:3:2 respectively. How much marbles in the bag are blue?
One would take the ratios, and add them. 5+3+2 = 10 The divide the total number of marbles by the sum of the ratios. 130/10 = 13 And finally multiply the quotient by each of the three numbers in the ratio (5:4:3) to get the number of marbles that are each colour. Red: 13 * 5 = 65 Blue: 13 * 4 = 52 Green: 13 * 3 = 39 Therefore, there are 52 blue marbles in the bag.
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