Question

Mary is half as old as Joseph. The sum of their ages is 51. How old are they now?

Answer 1

herr is your ans

let age of joseph = x

so, age of marry = 1/2x

given : x +x/2 = 51

so, x = 34

age of joseph = 34 years

age of marry = 17 year

Answer 2

Answer:

Let Mary's age be x

and Joseph's age be y

Given,

            x = y/2

            2x = y

            2x - y = 0 _(1)

And,

          x + y = 51 _(2)

From (1) and (2)

We get,

               2x - y = 0

               x + y = 51                                                                                                                            ------------------------------------

         3x =  51

            x = 17

            y = 34