The sum of the present age of a mother and her son is 35 and the difference is 25 years. find their present age.(By substitution or elimination method).

Son = 5 years old

Mum = 30 years old

Step-by-step explanation:

Let the Mum be M and the Son be S;

--- Sum

-- Difference

Required

Find M and S (their ages)

Using elimination method; Add both equations to eliminate S

----------------

Solve for M

Substitute 30 for M in

Solve for M

Hence:

Son = 5 years old

Mum = 30 years old

597

step-by-step explanation:

mean, 40.6

step-by-step explanation: