I think you are supposed to make the fraction equivalent so you know that 27/9 is 3, so you would do the same thing whatever number is supossed to be under 17 needs to equal to 2 when divided by 9. So you should probably know that 3 * 9 is 18 so x needs to be a number that when subtracted by 5 gives you 18. So x=23. Hope this is right and it helps!
Missing Part:
a. A red ball is drawn
b. A white ball is drawn
Answer:
a.
b. 
Step-by-step explanation:
Given



First, we need to calculate the total



Solving (a): Probability of Red.
This is calculated by dividing number of red balls by the total
So:



Solving (a): Probability of White.
This is calculated by dividing number of white balls by the total
So:



The answer is 12. you first divide 20 by 4 and get 5. then you subtract 5 by 5 and get 0. then you add 12 plus 0 and get 12
Hope I Helped :D