1.

Find the largest number which exactly divides 20, 40 and 60.

Answer»

Factors of 20 – 1, 2, 3, 4, 5, 10, 20

Factors of 40 – 1, 2, 3, 4, 5, 8, 10, 20, 40

Factors of 60 – 1, 2, 3,4, 5, 6, 10,12, 15,20, 30,60

Therefore common factors of 20,40 and 60 – 1, 2 4, 5, 10, 20.

Highest factor of 20, 40 and 60 = 20.



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