Steps
Let x be the number.
Half of the number is x/2
x plus x/2 equal 18
(3x)/2 equals 18
3x equals 36
x equal (36)/3
x equal 12
Answer
12
Let x be the number.
Half of the number is x/2
x plus x/2 equal 18
(3x)/2 equals 18
3x equals 36
x equal (36)/3
x equal 12
12