Question 1173216

Mum is 3 times as old as I am. she was 30 when I was born. what are our ages? 
<pre>Let my age be I
Then mum's is: 3I
Since mum was 30 when I was born, mum will ALWAYS be 30 years older than me.
Therefore, we get: 3I = I + 30
Solve that for I to get my age. Add 30 to I to get mum's age!
That's it!!