13. Is 18
15. Is 86
17 is 5
19 is 15
21 is 24
23 is 29
He has a total of 7 Boards. he has 3 boards of his own and then you add the 4 additional boards that he has
Hey!
RS = 15 and RT = 18. Subtract 18 from 15 to get your answer.

<em>That means your answer is 3</em>

Answer:
10:9
Step-by-step explanation:
First ratio is 5:4. 4 is equal to Henry class
If you múltiply the ratio by 2 you get
10:8, This ratio can be compared because now Henry class has 8
2(5:4)
10:8
8:9
Meaning that the answer is 10:9