Question

Sam is 10 years younger than one-half the age of his aunt. Let a represent his aunt’s age. Which shows his aunt’s age written as an algebraic expression and Sam’s age if his aunt is 40?
Sam is 2 years old
Sam is 6 years old
Sam is 10 years old
Sam is 30 years old

Answer 1

Sam is 10. 
40=(1/2) + 10
40*.5 =20
20 - 10 = 10

Answer 2

Sam is 10 years old because 20 is half of 40 and 20 subtract 10 is 10