So what you have to do is make the denominators equal. You do that by finding out what number they can both go into which is 60. 12 can go into 60 5 times and so you have to do 9/12 times 5 which is 40/60. then 5 goes into 60 12 times so you have to do 1/5 times 5 which is 12/60. Then you see that 40/60 >12/60 therefore the class ate more of the pepperoni pizza
Answer:34.2
Step-by-step explanation: I just did it in delta math
Answer:
No, he is not correct because the constant in his answer should have been 21 not 7.
Step-by-step explanation:

Therefore, the correct answer is the fourth; he should have put 21.
Answer:
x=22
Step-by-step explanation:
2x-40+8x=180
10x=220
x=22