Answer: 
Step-by-step explanation:
You can reduce the fractions, then:



Rewrite them as following:

If you subtract the first number and the second number, you obtain:

If you subtract the second number and the second number, you obtain:

Therefore, you must subtract
and
to obtain the number asked. Then, this is:

Answer:
17. 20
18. 50
19. 50
20. 70
21. 110
22. 160
Step-by-step explanation:
I did this assignment already :)
.80 cent if you wright it in percent its 80%
2÷3 3 goes into 2 0 times so add 0 to make 20 3goes into 20 6 time so the answer is 0.6666666