The sum of twice a number and four times the number is 54. Find the number.

number is 9

2n+4n=54

6n=54

n=9

Twice a number can be written as 2n.

Four times the number can be written as 4n.

If the sum of 2n and 4n equals 54, then:

6n = 54

Divide both sides by 6 to solve for n:

n = 9