Question

The sum of three numbers is 72 the second number is 7 times the first the third number is 18 less than the second, what is the first number?

Answer 1

Answer:

6

Step-by-step explanation:

6+42+24=72

Answer 2

Answer:

x = 6

Step-by-step explanation:

Let the first number be x

Third number = 7x - 18

Second number = 7x

Now solve all the x

The sum of the 3 numbers is 72

x + 7x + (7x - 18) = 72

x + 7x + 7x - 18 = 72

15x - 18 = 72

15x = 90

x = 90 ÷ 15 = 6

So,

First number = 6

Therfore, x = 6