[Question]: Mark is 18 years old. He has a little brother, John, who is 10 years younger. If John and Mark's parents are currently 5 times older than John, how old were they when Mark was born?
[Answer]: John is 8 years old because 18 - 10 = 8 years old. Their parents are currently 40 years old because 8 * 5 = 40. Therefore, they were 22 when Mark was born because 40 - 18 = 22 years old.
So the answer is 22.

[Question]: A local school is holding a food drive. Mark brings in 4 times as many cans as Jaydon. Jaydon brings in 5 more than twice the amount of cans that Rachel brought in. If there are 135 cans total, how many cans did Mark bring in?
[Answer]: Let x represent the number of cans Rachel brought in. Jaydon:5 + 2x. Mark:4(5 + 2x) = 20 + 8x. Total:x + 5 + 2x + 20 + 8x = 135. 11x + 25 = 135. 11x = 110. x = 10. Mark: 20 + 8(10) = 100 cans.
So the answer is 100.

[Question]: Anderson makes mud masks for spa treatments. In every batch of mud that he mixes, he adds three sprigs of mint, and he adds two green tea leaves for every sprig of mint. He had to switch to a different kind of mud, which makes the other ingredients he adds half as effective. How many green tea leaves should Anderson add to a new batch of mud to get the same efficacy as before?
[Answer]:
Anderson adds 3 * 2 = 6 green tea leaves in every batch of mud. They are half as effective in the new mud, so Anderson should ad 6 * 2 = 12 green tea leaves to get the same efficacy as before.
So the answer is 12.