6 2/3 = 20/3 = 60/9
4 4/9 = 40/9
60/9 - 40/9 = 20/9 = 2 2/9

So, there are 4 solutions.
Answer:
Hmmmm, very tricky question but I'll figure it out and type it in the comments
Volume is length x width x height aka (L•W•H)
Answer:
Okay the question is a little unclear, but if he's only doing english, science and history the answer should be <u> 17/40</u>
Step-by-step explanation:
1/5=8/40
3/8=15/40
8/40+15/40=23/40
40/40-23/40=17/40