Question

pls answer only of you know pls if you want free point i will ask later ​

Answer 1

$50 - 20 = 30 \\30 - 15 = 15 \\ 15 - 9 = 6 \\ 6 - 6 = 0\\============\\101 - 50 = 51$

The problem says we get 51 when we add the balances.  but we must get 50 - is the idea.

However, we should only add the spent amounts.  We cannot add the balances.. See the following example I give here.   In this, start with 50 and spend 10 in 5 steps.  Then balances will be 40, 30 etc.

 $50 - 10 = 40 \\ 40 - 10 = 30\\ 30 - 10 = 20\\ 20 - 10 = 10\\ 10 - 10 = 0\\=============\\ 50 = 100$

Hope It Helps...

Answer 2

Answer:

20+15+9+6=50

30+15+6+0=51