Answer
Estimate: 80.
The answer given (78.3) is reasonable.
Work Step by Step
We need to check whether the answer given is reasonable:
$395.415\div 5.05=78.3$
We estimate the answer by rounding:
$395.415\div 5.05\approx 400\div 5=80$
We see that the given answer, $78.3$, and the estimate, $80$, are very close. Thus the given answer is reasonable.
(We do not need to find the exact answer if the answer is reasonable.)
