Problem
First name
Logan Arnold-Lee
School
Colfe's
Country
Age
14
Email address
loganarnoldlee20028@gmail.com
5, 15, x, 7, 17, 9
=> (5+15+x)/3=(x+7+17+9)/4
=> (20+x)3=(33+x)4
=> 80+4x=99=3x
=> x= 19