Would you multiply or divide in this question, " out of 18 times, emily got a hit 5/6 of the time and julie got a hit 8/9 of the time. who got more hits? how many more? " ?

Common ratio, exponential function, half-life that's all i have so

1) add 6 to 24, write the rest of the equation 10-2x= 30 subtract 10 from 30 2x=20 divide 20 by 2 and x=102) add 3 to -9 write the rest of the equation 4x+3=-6 subtract 3 from -6 4x=-9 x= -2.25  i don't know the rest sorry