Answer the following question.
Amiyah is cutting some trees to build a cow shade. For every tree she cuts, she plants 5 new trees. If there were 400 trees on her farm and she cut 20% of them, calculate the total number of trees on the farm.
Step-by-step reasoning process: The number of trees that Amiyah cut is 20 / 100 * 400 = 80. The number of trees remaining on the farm after she cut 80 trees is 400 - 80 = 320. For every tree that Amiyah cut, she plants 5 new trees, and since she cut 80 trees, she planted 80 * 5 = 400 new trees. The total number of trees on the farm is now 320 + 400 = 720 trees.
The answer is 720.

Answer the following question.
Mandy is 3 years old. Her brother is 4 times as old as she is. Her sister is 5 years younger than her brother. What is the age difference between Mandy and her sister?
Step-by-step reasoning process: Mandy's brother's age is 3 years x 4 = 12 years old. Her sister's age is 12 years - 5 years = 7 years old. The age difference between Mandy and her sister is 7 years - 3 years = 4 years.
The answer is 4.

Answer the following question.
Stefan, Vail, and Aiguo collected seashells. Stefan had 16 more seashells than Vail. Vail had 5 less than Aiguo. Aiguo had 20 seashells. How many seashells did the 3 children have in total?
Step-by-step reasoning process: Aiguo = 20 shells. Vail = 20 - 5 = 15 shells. Stefan = 15 + 16 = 31 shells. Total = 20 + 15 + 31 = 66. The 3 children had 66 seashells altogether.
The answer is 66.

Answer the following question.
5 squirrels collected 575 acorns. If each squirrel needs 130 acorns to get through the winter, how many more acorns does each squirrel need to collect?
Step-by-step reasoning process: Each squirrel now has 575 / 5 = 115 acorns. Each squirrel still needs to collect another 130 - 115 = 15 acorns.
The answer is 15.