I don't know how to earn money through solving maths . But I can give you some other way
Earning money online is becoming famous each day..
You can earn money easily.
All you need to do is download WeOne app .. it is available at both Android and ios.
And you can earn a alot of money (around 10 thousand )
All u need to do is -
1 install the app
2 open it verify your mobile
3 you will need to enter a reference code
Here is one - 8cakv
4 all you need to earn is see 3 ads daily(each of 15–25 sec )
5 and start spreading this app to freinds
Remember you need reference to enter so use 8cakv