Mathematicians should solve this riddle

OP, this is not a riddle and not tough either.
Expecting the summation of balances after piecemeal expenditure to be same as the original amount is not valid.

To prove my point, instead of the expenditure of 20, 15, 9 & 6, do the expenditure in this order; 6, 9, 15 & 20 then add the corresponding balances exactly the same way, you will arrive at a very huge difference.

That is,

6 balance 44
9 balance 35
15 balance 20
20 balance 0

Sum of expenditure 20 + 15 +9 +6 =50
Sum of balance 44 +45 +20 +0 =99.
Now where does 49 come from?

So, addition of balances after expenditures doesn't mean it must tally with total expenditure, but what is important is that total expenditure must equal total amount originally in possession.

My humble submission.

nextprince:
Brb

please be fast

hakeem4:
please be fast

Done.

Na addition me I see for here O!
After adding both sides seperately I get 50 and 51....though stil looking for the riddle...'

This Buhari govt son turn Nigerians to think tanks. Imagine someone donbration him Monet finish and him still want come get am back.

Fiai! e no go work.

In Mathematics, we should know that balance and sum are never the same.
For e.g. if you have 50 and spend 1 you are left with 49, Then if you spend 2 more you are left with 47, The balance after more than one sub is never the sum of total in Maths.
As 49+47 is not 50. This clarifies this solution technically.
Thanks

randyenyi:
In Mathematics, we should know that balance and sum are never the same.
For e.g. if you have 50 and spend 1 you are left with 49, Then if you spend 2 more you are left with 47, The balance after more than one sub is never the sum of total in Maths.
As 49+47 is not 50. This clarifies this solution technically.
Thanks

thanks