SOLUTION: Pamela is 5 years older than Jiri. The sum of their ages is 65. What is Jiri's age?

Question 1206478: Pamela is 5 years older than Jiri. The sum of their ages is 65. What is Jiri's age?

Found 3 solutions by josgarithmetic, MathLover1, ikleyn:
Answer by josgarithmetic(39620)   (Show Source): You can put this solution on YOUR website!
j for Jiri
j+5 for Pamela

.
.
Without doing any written steps, you may figure, j=30.
Answer by MathLover1(20850)   (Show Source): You can put this solution on YOUR website!

let Jiri's age be
if Pamela is years older than Jiri, her age is

if the sum of their ages is , then

Jiri is years old

Answer by ikleyn(52814)   (Show Source): You can put this solution on YOUR website!
.

To solve it mentally, take off for a moment 5 extra years of Pamela's age
and take off 5 extra ages from 65.

Then you will have two persons of equal ages with the sum of their ages of 65-5 = 60 years.

So, to get the Jiri's age, you simply should divide 60 by 2, which is not so difficult.

Do you agree ?

Is everything clear to you from my mental solution ?

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