Problems on H.C.F and L.C.M
A rectangular courtyard 3.78 metres long and 2.25 metres wide is to be paved exactly with square title, all of the same size. What is the largest size of the tile which could be used for the purpose

11 cms
21 cms
42 cms
None of these

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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 ?

420
630
770
540

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