I do know the bottom one is 2.8
Top is 1.6
I don’t know the middle one
Please excuse my dear aunt sally ( parentheses, exponents, multiplication, division, addition, and subtraction )
1. 72 to 50 points
50/72 = 69%
100-69= 31% decrease
2. 14 to 40 books
14 / 40 = 35%
100-35= 65% increase
3. 10 plus 30% increase
10 * 0.3 = 13
Well,
We can read 9.33 as 9 and 33 hundredths.
In fraction form that would be:

That is already simplest form.
If you meant

, then it would be:
the 2 numbers are 8 and 40
40*2 = 80 +8 = 88