Question 1198724
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The number of dolphins varies directly as the number of tuna.  The number of tuna changes by a factor of 16/125, so the number of dolphins changes be a factor of 16/125.<br>
The number of dolphins varies inversely as the square of the number of sharks.  The number of sharks changes by a factor of 2/5, so the number of dolphins changes by a factor of (5/2)^2 = 25/4.<br>
ANSWER: (50)(16/125)(25/4) = 40<br>