Its 18. Because if u divide 5 to 2 u get 2.5. Which is their difference in the thing. And basically it’s 45:green apples so u just divide 45 to 2.5 and u get 18
40/100 is just a bigger example of 4/10
7.8 or if you are rounding it’s eight
Yes
Explanation:
2x9=18 and 1+8=9
The pattern repeats