Question

When Aaliyah picks any number between 1 and 20, doubles it, adds 6, divides it by 2 and subtracts 3, she always gets the number she started with.

Answer 1

(2x + 6) ÷ 2 - 3
= 2(x+3) ÷ 2 - 3
= x + 3 - 3
= x