Answer:
m=5
Step-by-step explanation:
c=30m+50
c=20m+100
substitute
20m+100=30m+50
like terms
100-50=30m-20m
50=10m
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The answer you are looking for is the part d
10
20
correct c=3 x 10
incorrect i=-1
-------
incorrect= 10
number of questions= 10+10= 20