Paul is two years younger than Patricia. Daniel is 25% older than Patricia. Ten years ago, Daniel was 50% older than Patricia. How old is Paul currently?

In this question, you can get 3 formula which was

1. Paul = Patricia - 2

2. Daniel = Patricia * 1.25

3. Daniel - 10 = (Patricia-10) * 1.5

Daniel - 10 = 1.5 Patricia - 15

Daniel = 1.5 Patricia - 5

If you insert the 2nd equation into the 3rd, then you will get

1.25 Patricia = 1.5 Patricia - 5

0.25 Patricia = 5

Patricia = 20

Then insert the result into 1st equation

Paul = Patricia - 2 = 20-2 = 18 years