You can substitute 20 + d for c in the first equation which gives you
20+ d = 100 - d then solve
2d = 80
d= 40
then put the value for d back into one of the original equations
c= 20 + d
c = 20 + (40)
c = 60
152 * 4= 608
608+2= 610
If this isnt what you mean then I'm sorry.I guess I just don't understand the question
10, 10, 20 or either of u talking abt about tah the whole either 0-100
34/12 simplified as a fraction is 17/6 or as a mixed fraction it is 2/5/6 or 2 times 5/6
hope u understand, and hope it was helpful