Conditions as stated in the question:
\(\frac{\frac{}{Monday} \leq \frac{}{Tuesday} \leq \frac{}{Wednesday} \leq \frac{}{Thursday} \leq \frac{}{Friday} \leq \frac{}{Saturday} \leq \frac{}{Sunday}}{\Sigma{76 Fish}}\)
(1)
\(\frac{\frac{8}{Monday} \leq \frac{8}{Tuesday} \leq \frac{12}{Wednesday} \leq \frac{12}{Thursday} \leq \frac{12}{Friday} \leq \frac{12}{Saturday} \leq \frac{12}{Sunday}}{\Sigma{76 Fish}}\)
\(\longrightarrow NO\)
\(\frac{\frac{8}{Monday} \leq \frac{10}{Tuesday} \leq \frac{10}{Wednesday} \leq \frac{12}{Thursday} \leq \frac{12}{Friday} \leq \frac{12}{Saturday} \leq \frac{12}{Sunday}}{\Sigma{76 Fish}}\)
\(\longrightarrow YES\)
\(\longrightarrow INSUFFICIENT\).
(2)
Let \(X\) represent the # of fish caught Tuesday. Then:
\(\frac{\frac{}{Monday} \leq \frac{X}{Tuesday} \leq \frac{X+4}{Wednesday} \leq \frac{}{Thursday} \leq \frac{}{Friday} \leq \frac{}{Saturday} \leq \frac{}{Sunday}}{\Sigma{76 Fish in Total}}\)
Let's figure out what the other values can be. Let's assign some variables.
\(\frac{\frac{A}{Monday} \leq \frac{X}{Tuesday} \leq \frac{X+4}{Wednesday} \leq \frac{B}{Thursday} \leq \frac{C}{Friday} \leq \frac{D}{Saturday} \leq \frac{E}{Sunday}}{\Sigma{76 Fish}}\)
We want:
\(A + X + (X + 4) + B + C + D + E = 76\)
\(0 \leq A \leq X \leq (X+4) \leq B \leq C \leq D \leq E \leq 12\)
What are the maximum possible values for each? 12. Substituting in we get:
\(0 \leq A \leq X \leq (X+4) \leq B \leq C \leq D \leq 12 \leq 12\)
\(E=12\)
\(0 \leq A \leq X \leq (X+4) \leq B \leq C \leq 12 \leq 12 \leq 12\)
\(D=12\)
\(E=12\)
\(0 \leq A \leq X \leq (X+4) \leq B \leq 12 \leq 12 \leq 12 \leq 12\)
\(C=12\)
\(D=12\)
\(E=12\)
\(0 \leq A \leq X \leq (X+4) \leq 12 \leq 12 \leq 12 \leq 12 \leq 12\)
\(B=12\)
\(C=12\)
\(D=12\)
\(E=12\)
\(0 \leq A \leq X \leq (X+4) \leq 12 \leq 12 \leq 12 \leq 12 \leq 12\)
\(X+4=12 \longrightarrow X=8\)
\(B=12\)
\(C=12\)
\(D=12\)
\(E=12\)
\(0 \leq A \leq 8 \leq 12 \leq 12 \leq 12 \leq 12 \leq 12 \leq 12\)
\(X=8\)
\(B=12\)
\(C=12\)
\(D=12\)
\(E=12\)
\(0 \leq 8 \leq 8 \leq 12 \leq 12 \leq 12 \leq 12 \leq 12 \leq 12\)
\(A=8\)
\(X=8\)
\(B=12\)
\(C=12\)
\(D=12\)
\(E=12\)
\(A + X + (X + 4) + B + C + D + E = 8 + 8 + (8+4) + 12 + 12 + 12 + 12 = 8 + 8 + 60 = 76\)
So there is only one possible arrangement possible, because if we take anything less than the maximum, the days won't sum to 76 as required in the question.
\(\frac{\frac{8}{Monday} \leq \frac{8}{Tuesday} \leq \frac{12}{Wednesday} \leq \frac{12}{Thursday} \leq \frac{12}{Friday} \leq \frac{12}{Saturday} \leq \frac{12}{Sunday}}{\Sigma{76 Fish}}\)
\(\longrightarrow SUFFICIENT\)
Final Answer, \(B\).
\(\surd\)