[Question]There were 20 fishermen in the lake who had cast their net to catch fish. If they caught 10000 fish in total, and 19 of them caught 400 fish each with their own net, calculate the number of fish the twentieth fisherman caught.
[Answer]The 19 fishermen who caught 400 fish each caught 400 * 19 = 7600 fish. If they caught a total of 10000 fish, the twentieth fisherman caught 10000 - 7600 = 2400 fish alone. The answer is 2400.

[Question]Mr. Llesis had 50 kilograms of rice. He kept 7/10 of it in storage and gave the rest to Mr. Everest. How many kilograms of rice did Mr. Llesis keep than Mr. Everest?
[Answer]Mr. Llesis kept 50 x 7 / 10 = 35 kilograms of rice. So, he gave 50 - 35 = 15 kilograms of rice to Mr. Everest. Therefore, Mr. Llesis kept 35 - 15 = 20 kilograms more than Mr. Everest. The answer is 20.

[Question]300 cows in a field are made up of male and female cows. There are twice as many females as males. Half the females are spotted, and half the males have horns. How many more females with spots are there than males with horns?
[Answer]There are (300 / 3) x 2 = 100 x 2 = 200 females cows in the field. There are 200 / 2 = 100 male cows in the field. 200 / 2 = 100 female cows are spotted. 100 / 2 = 50 male cows have horns. There are 100 - 50 = 50 more females with spots than males with horns. The answer is 50.

[Question]Erica is telling her grandson about the animals she saw during her recent safari in Kenya's Maasai Mara. On Saturday, she saw 3 lions and 2 elephants. She spotted 2 buffaloes and 5 leopards on Sunday, and 5 rhinos and 3 warthogs on Monday. What is the total number of animals that Erica saw?
[Answer]
On Saturday, Erica saw 3 + 2 = 5 animals. On Sunday she spotted 2 + 5 = 7 animals. On Monday, she saw 5 + 3 = 8 animals. Adding up all the animals Erica saw gives a total of 5 + 7 + 8 = 20 animals. The answer is 20.