The sum of the ages of john and mary is 32. four years ago, john was twice as old as mary . find the present age of each

John is  

20

Mary  

12

Step-by-step explanation:

We can use one variable to define their ages because we know the relationship between their ages.

Mary is younger, let Mary's present age be  

x

years,

Then John's present age is  

32

−

x

years (Sum of their ages is  

32

)

4

years ago, they were both  

4

years younger than now.

Mary was  

(

x

−

4

)

and John was  

(

32

−

x

−

4

)

=

(

28

−

x

)

years old.

John was twice as old as Mary:

2

(

x

−

4

)

=

28

−

x

2

x

−

8

=

28

−

x

3

x

=

28

+

8

3

x

=

36

x

=

12

Mary's age is  

12

and John's age is  

20

relating to or denoting a system of numbers and arithmetic based on the number ten, tenth parts, and powers of ten.

it alot will look like this 4.4

you could deduce the conclusion directly using the facts pertaining to the specific situation.

hope this .