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For #3 Nelson scored 29, because Craig scored 12 and Marla scored twice as craig, which was 24. After that we found out that she has 5 fewer than Nelson, witch would be plus 5.

I think the answers would be 
1.) 4 1/2 * 4 2/3= 9/2 * 14/3 then i canceled out 9 and 3 and 2 and 14 and got 3*7= 21 pounds
2.) 5 5/8 * 1 5/9= 45/8 * 14/9 then i canceled out 45 and 9 and got 5/8 * 14= 19/8
3.) 12*2-5 and if you want it solved its 12*2= 24 -5= 19
4.) 66/8 = 8.25 thats how much yvette earns and then you would just do 68.8/8=8.60 thats how much lizbeth earns 
5.) it would be 100 because 10*10 = 100 and 4*25=100 and no other smaller number could fit into it 
6.) 4 5/8 + 3 3/4 - 11 1/8
37/8 +15/4= 37/8+30/8=67/8
67/8-11 1/8= 67/8-89/8= 22/8 or 2 3/4