Answer this 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?
Dried up:800(.10) = 80 eggs. 800(.70) = 560 eggs. Total left:800 - 80 - 560 = 160 eggs. 160 / 4 = 40 eggs survive to hatch.
The answer is 40.

Answer this question:A cake of 400 grams is divided into eight equal parts. Nathalie eats one-eighth of the cake, and Pierre eats double what Nathalie ate. How much did Pierre eat, in grams?
Nathalie ate 1 / 8 * 400g = 50g of cake. Pierre eats 2 * 50g = 100g of cake.
The answer is 100.

Answer this question:Rebecca bought 22 items for her camping trip, including tent stakes, packets of drink mix, and bottles of water. She bought 3 times as many packets of drink mix as tent stakes. She also bought 2 more bottles of water than she did tent stakes. How many tent stakes did she buy?
Let x represent the number of tent stakes. Drink Mix: 3x. Bottles of Water: x + 2. Total: x + 3x + x + 2 = 22. 5x + 2 = 22. 5x = 20. x = 4 tent stakes.
The answer is 4.

Answer this question:Camille saw 3 cardinals and four times as many robins as cardinals while bird watching. She also saw twice as many blue jays as cardinals and 1 more than three times as many sparrows as cardinals. How many birds did Camille see?
Camille saw 3 x 4 = 12 robins. She also saw 3 x 2 = 6 blue jays. Triple the number of cardinals is 3 x 3 = 9. So, she saw 9 + 1 = 10 sparrows. Therefore, Camille saw 3 + 12 + 6 + 10 = 31 birds.
The answer is 31.