Question

the ratio of boys to girls in a senior class is 5:3. if 9/10 of the boys may graduate and all the girls may or may not graduate, what is the maximum part of the senior
class that may graduate?

Answer 1

(9/10)(5/8) = 9/16

Answer 2

oops. That figure applies if no girls graduate.

If all the girls graduate, then

9/16 + 3/8 = 15/16 may graduate.