<span>11.5 Not sure but it should be the answer!!
</span>
If we had AB: BC: CD, we could easily have solved that problem. In order to combine these ratios, we need to have the same number for BC. We can create this number by finding LCM (Least Common Multiple) for 5 and 3, which is 15. Then, we can write ratios of AB:BC = 6:15 and BC:CD=15:20. Now, we can easily combine these ratios. AB:BC:CD = 6:15:20. Then, 6k+15k+20k = 82 and k=2 cm. And BC = 30 cm
The answer is 13!
Follow PEMDAS (:
Assuming you didn't forget parentheses, it's C. Hope this helped.
Answer:
612
Step-by-step explanation: Im guessing ran out of time