Problems on H.C.F and L.C.M
Three numbers which are co-prime to each other are such that the product of the first two is 551 and that of the last two is 1073. The sum of the three numbers is:

95
85
80
90

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Problems on H.C.F and L.C.M
What will be the least number which when doubled will be exactly divisible by 12, 18, 21 and 30 ?

630
540
770
420

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