20
Each time it divides by 2... 160/2=80; 80/2=40; 40/2=20
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40 5 10 20 40 80 160.......double the number each time.
The 40th number in the sequence will be 40 x 4, or 160.Reasoning:Because the sequence is multiples of 4.The 1st number in the sequence is 1 x 4, or 4.The 2nd number in the sequence is 2 x 4, or 8...The 4th number in the sequence is 4 x 4, or 16...The 17th number in the sequence is 17 x 4, or 68
40
160 is 400% of 40. 40 * 400% = 40 * 4.00 = 160
Looks like 51 and 62 are missing...