If b is a positive integer less than 8, is c less than the average (arithmetic mean) of b and 8?
1. On the number line, c is closer to 8 than it is to b.
Trying substituting some values for b.
e.g.: b=1 ; (8 + b) / 2 = 4.5;
c is closer to 8 i.e. c =5; so sufficient.
2. c = 4b
Again trying substituting some values for b.
e.g.: B=1 c= 4; (8 + b) / 2 = 4.5 => c < b
B=2 c = 8; (8 + b) / 2 = 5 => c > b
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