Use reasoning to answer the following question.
A frog lays 800 eggs a year. 10 percent dry up, and 70 percent are eaten. 1/4 of the remaining eggs end up hatching, how many frogs hatch out of the 800?

40
Dried up:800(.

10) = 80 eggs.

800(.

70) = 560 eggs.

Total left:800 - 80 - 560 = 160 eggs.

160 / 4 = 40 eggs survive to hatch.

.

So, the answer is 40