i don’t know for sure but i just figured it out....
Answer:
6
Step-by-step explanation:
Answer: 21
The ratio of sides from large to small is<u> </u><u>2/3</u>
30*2/3= 20
27*2/3=18
21*2/3=14
2 1/2 seconds
10×1/4=10/4=21/2 seconds
