Question 304740
It's probably 20 because 20 will not allow you to get anything that is not a multiple of 20.


102 is not a multiple of 20 and 115 is not a multiple of 20.


All of the others will allow you to get in the range.


5 * 21 = 105
10 * 11 = 110
12 * 9 = 108
15 * 7 = 105
20 * 5 = 100 which is out of range.
20 * 6 = 120 which is out of range.


Answer is selection E (20).