Question 1019078
A total of five comes up 1/9 of the time.
A total of ten comes up 1/12 of the time.
The probability of getting a five or a ten is
1/9 + 1/12 = 7/36
7/36 times 20 rolls is almost four times...
A third way to express this is
{{{7/36 = x/20}}}
and
x = 3.889