Emily has 4 kids named Amy, Jackson, Corey, and James. Amy is 5 years older than Jackson and 2 years younger than Corey. If James is 10 and is 1 year younger than Corey, how old is Jackson?
Work out the solution step by step. 
James is 10 and 1 year younger than Corey, so Corey is 10 + 1 = 11 years old
Amy is 2 years younger than Corey so is 11 - 2 = 9 years old
Amy is also 5 years older than Jackson, so Jackson is 9 - 5 = 4 years old