Every 12th box gets a whistle and a ball because 12 is the lowest common factor of 6 and 4.
f(x)=20+300x
Also, Rex should find a different pool because that fee is ridiculous.
How old is Tracy? Seriously it just says 6 the only number and who is younger than Tracy?!
Lets say our number is 237x8
2+3+7+8+x should be divisible by 6.
20+x should be divisible by 6.
x=4
