Another Lawson's question:
THE FROGS
Professor Thistlebush wants to know approximately how many frog live in the pond near his home. Because he could not catch all the frogs, he caught as many as he could, put a band around their left hind legs, and then put them back in the pond. A week later he returned to the pond and again caught as many frogs as he could. Here are the Professor's data.
First trip to the pond
55 frogs caught and banded
Second trip to the pond
72 frogs caught, of those 72 frogs, 12 were banded
The Professor assumed that the banded and un-banded frogs had mixed thoroughly and from his data he was able to compute the approximate number of frogs in the pond.
What do you think is the approximate number of frogs in the pond?
a) 72
b) 115
c) 275
d) 330
Explain your answer.