There are 4 reds out of 10 so the probability for a red would be 4/10 and for a yellow it would be 1/10. multiply them together to get 4/100 so your probability would be 1/25 or 0.04 or 4%
I don't know which form you want but here
Exact form: 5/4
decimal form is: 1.25
mixed number form:
1 1/4
2x+7
is the simplest form
