Question

A second number is 6 less than a first number. A third number is twice the first number. If the sum of three number is 306, find the numbers

Answer 1

first number = 78

second number = 72

third number = 156

Explanation:

first number = a

second number = b

third number = c

we have

b=a-6 equation 1

c=2a equation 2

a+b+c=306 equation 3

using equation 1 and equation 2 in equation 3 we have

a+a-6+2a=306

4a=306+6

4a=312

a=312/4

a=78= first number

b=78-6=72=second number

c=2*(78)=156 third number