Answer:
Answer: A. 5:4 Step-by-step explanation: Since the question mentions twelfths of a pie, it is easier to say each pie has 12 pieces or 36 total pieces ordered from the 3 pies. Ty ate 5 and Rob ate 15 which is 3 times more than Ty. A total of 20 pieces have been eaten from the 36 you started with. Eaten = 16. So the ratio is 20:16 which is simplified to = 20 and Remaining 5:4.
When we prime factorize, we get 180=2^2*3^2*5. So therefore there are 3 prime factors that make up 180.
40 over 100 and 55 over n cross multiply 55 x 100 and divide by 40.which gives you 137.5