What must be added with 3 1/2 to get 10 ?
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Let the number to be added be x. Then 1/2 + 1/ 3 + 1/5 + x = 3 Taking L.C.M, (15+10+6+30x)/ 30 = 3 (31 + 30x) = 30 * 3 31 + 30x = 90 30x ...
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