Not sure about "completes" because the sequence continues.
The next number is 20 and you can verify that by fitting the following cubic equation:
u(n) = 5*(-n3 + 36n2 - 257n + 558)/12 for n = 1, 2, 3, 4, ...
35
If you want to take 25% of off 140. Multiply 140 by .4 to find 25% (this is 35). Then subtract 35 from 140: 140-35 = 105. You could also subtract 25 from 100: 100-25 =75. Then multiply 140 by .75 and you will get 105.
15, 21, 25, 35, 75, 105, 175, 525
The factor pairs of 525 are: (1, 525), (3, 175), (5, 105), (7, 75), (15, 35).
105/75=1.4 1.4 X 100=140% 140%
35
If you want to take 25% of off 140. Multiply 140 by .4 to find 25% (this is 35). Then subtract 35 from 140: 140-35 = 105. You could also subtract 25 from 100: 100-25 =75. Then multiply 140 by .75 and you will get 105.
35
15, 21, 25, 35, 75, 105, 175, 525
75/175 = 42.857%
175 is 75% of 233.33
75
7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, 91, 98, 105, 112, 119, 126, 133, 140, 147, 154, 161, 168, 175.
It is: 3/7 times 175 = 75
The factor pairs of 525 are: (1, 525), (3, 175), (5, 105), (7, 75), (15, 35).
1, 3, 5, 7, 15, 21, 25, 35, 75, 105, 175, 525
1, 3, 5, 7, 15, 21, 25, 35, 75, 105, 175, 525