The ratio of 4 blue marbles to 6 white marbles can be said as 4:6, 4 to 6, or 4/6.
This can then be simplified to 2:3 by a factor of 2.
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12 blue marbles
24
The ratios are: red : green = 2 : 3 = (2×3) : (3×3) = 6 : 9 green : blue = 9 : 4 → ratio of red : green : blue = 6 : 9 : 4 There are 6 + 9 + 4 = 19 parts 76 marbles ÷ 19 parts = 4 marbles per part → red: 6 parts = 6 × 4 marbles per part = 24 red marbles → green: 9 parts = 9 × 4 marbles per part = 36 green marbles → blue: 4 parts = 4 × 4 marbles per part = 16 blue marbles To check: red + green + blue = 24 marbles + 36 marbles + 16 marbles = 76 marbles in the bag.
45 __ 91
25 marbles = 7 blue + 4 green + 8 red + 6 yellow The ratio of blue to yellow marbles is 7:6