Problema Solution
John is seven years younger than his sister Ann. The sum of their ages is 45. Find John's age.
Answer provided by our tutors
Let
x = John's age
y = Anns's age
x = y - 7
x + y = 45
........
click here to see the system of equations solved for x and y
........
x = 19 years
y = 26 years
John is 19 years old.