Question

Mario and Luigi are brothers.marios age is three times the difference between Luigis age and the number 9.if Mario is 18 years old,how old is Luigi.show your work.

Answer 1

To solve this, write an equation to model the situation and solve the equation.

The equation can be: $3(x-9)=27$

Then solve the equation.

$3x-27=18$

$3x=45$

$x=15$

Luigi is 15 years old.