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If three numbers are 2a, 5a and 7a, what will be their LCM?
23, 42.2, 80.6, 157.4, 311, ?
39, 52, 78, 117, 169, ?
12, 16, 22, 33, 51, ?
Find the sum of first 84 even numbers.
What number should be added to 231228 to make it exactly divisible by 33 ?