Answer:3/35
Step-by-step explanation:

Chance of boy: 627/1,358
Chance of girl: 731/1,358
Do you mean 5+7?
If so, that equals 12!
Answer:
The unknown number is 2/15.
Step-by-step explanation:
4/5+x=14/15
x=14/15-4/5
x=14/15-12/15
x=2/15
7.5795 ounces of the bar are silver.