Answer :

The first 5 multiples of 4 are 4, 8, 12, 16, 20. The first 5 multiples of 10 are 10, 20, 30, 40, 50. 
alexroserael
20, 40, 60, 80, 100

4 x 5 = 20
10 x 2 = 20

Keep going by multiplying these factors by two.

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