Question

I have rs 50, spend 20 balance 30, spend 15 balance 15, spend 9 balance 6, spend 6 balance 0, total spend amount is 50
if u calculate balance will get 51, Why?

Answer 1

the assumption that the sum of amount spent=sum of balance is incorrect
assume that I 10 rs

spend 1 balance 9
,,. 1. ,,. 8
,,. 1. ,,. 7
,,. 1. ,,. 6
,,. 1. ,,. 5
,,. 1. ,,. 4
,,. 1. ,,. 3
,,. 1. ,,. 2
,,. 1. ,,. 1
spent totally 10 balance= 9+8+7+6+5+4+3+2+1 is equal to 45
10≠45

Answer 2

Answer:

Explanation:

Let’s see why this is so.

20+15+9+6=50

Now, Let’s look at the balances. I will write them in a different way.

30=50−20

15=30−15

6=15−9

0=6−6

So, Let’s see what happens when you add the balances

30+15+6=50−20+30−15+15−9+6−6

=20+10+30−15+15−9+6−6

=20+15+6+40−15−9−6

=(20+15+6+9)+1

And, That is why we are getting an extra 1. You are not adding the same numbers here. And, hence you get a different result..