Question

An emperor penguin made 460 dives in 12 hours. At this rate, how many dives did the penguin make in 3 hours?

Answer 1

This question is ratio based.
So 460:12
        ? : 3
To get from 12 to 3, you divide by 4 (3 is 1/4 of 12)
So...
Divide 460 by 4 too
460/4 = 115 dives in 3 hours

Answer 2

Proportionality, assuming constant rate. 460 dives/12 hours = x dives/3 hours. Solve for x.