Question

1. Find the common factors of:
(a) 20 and 28 (b) 15 and 25 (c) 35 and 50 (d) 56 and 120​

Answer 1

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Answer 2

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(a)

20 = 2² × 5

28 = 2² × 7

So, Common factor = 2² = 4

(b)

15 = 3 × 5

25 = 5²

So, Common factor= 5

( c)

35 = 5×7

50 = 2 × 5²

So, common factor = 5

(d)

56= 2³ × 7

120= 2³ × 3 × 5

So, common factor = 2³ = 8

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