Question

Three multiplied by the sum of 4 and a number is the same as 18 more than the number. Find the number.

If n is "the number," which equation could be used to solve for the number?

Answer 1

3(4+n)=18+n
distribute
12+3n=18+n
minus n both sides
12+2n=18
minus 12 both sides
2n=6
divide by 2
n=3

the number is 3
equation is
3(4+n)=18+n