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You need to find a common denominator, in this case 8 * 9 * 11 =792 is the lowest common denominator (it doesn't always work out that the LCD will be found by just multiplying them together, but it will result in a common denominator).
3/8 = 297/792, 4/9 = 352/792, & 5/11=360/792, so (297+352+360)/792 = 1009/792 which as a mixed number: 1 217/792
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