Question

Pamela is 6 years younger than Jiri. The sum of their ages is 78 . What is Jiri's age?

Answer 1

Let’s make

P = Pamela
J = Jiri

J - 6 = P

P + J = 78

We can replace P with J - 6 because they are the same thing.

J - 6 + J = 78

2J - 6 = 78

2J = 84

J = 42

Jiri is 42 years old.