Answer:
9
a
2
b
4
3
a
3
b
3
Step-by-step explanation:
Posting screenshot of my answer in the linked question in case it gets deleted.
Remark
You have to read this carefully to know what way to write it.
One way you could write it would be
20 * x = 18 where x is the fraction. Now all you need do is divide.
Divide both sides by 20
20/20 * x = 18/20

But you should reduce this fraction. The way to do that is to factor 18 and 20 into primes.
18: 2 * 3 * 3
20: 2 * 2 *5
Cancel out the Highest common factor or 2.
You are left with
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50,000,000 because 45 is closest to 50,000,000.