Question

John is twice as old as Bill. Greg is 7 years older than Bill. Four years ago, the sum of their ages was 55. How old is Greg?

Answer 1

Answer:

Greg is 67 years old.

Step-by-step explanation:

John = 2 * B

G = 7 + B

J - 4 + B - 4 + G - 4 = 55

J + B + G = 67

2B + B + 7 + B = 67

4B = 60

B = 15

J = 30

G = 22

30 + 15 + 22 = 67

67 = 67

- I.A -

Answer 2

The age of Greg is 31 years.

What is a linear equation?

• A linear equation has one or two variables.
• No variable in a linear equation is raised to a power greater than 1.
• No variable is used as the denominator of a fraction.

• A linear equation is defined as an equation that is written in the form of ax+by=c.
• When solving the system of linear equations, we will get the values of the variable, which is called the solution of a linear equation.

solving this we will get the valve of Y if x is given.

Calculation:-

⇒let the actual age of Bill is X years.

      four years ago the age Bill = X-4

⇒   then, the age of John is twice of Bill = 2X

           four years ago age John = 2X-4

⇒Greg is 7 years older than Bill

       Age of Greg =  2X+7

 four years ago age Gerg = 2X+7-4

Four years ago Sum of their ages = 55

                  ⇒ ( X-4)+(2X-4)+(2X+7-4)=55

                ⇒X-4+2x-4+2x+7-4=55

               ⇒5X=60

              ⇒X=12

∴age of Gerg is 2X+7

                      ⇒2(12)+7

                      ⇒31 years

age of bill=12 years

age of John 24 years.

Learn more about linear equations here:-https://brainly.com/question/2972832

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