Question 166
At the hairdresser - three customers are at the hairdresser paying each one their cash account. - The first customer pays the same amount as there is at the cashier and withdraws 10 reais in change; - The second customer performs the same operation as the first; - The third client performs the same operation as the first two. Find the amount that was initially in the cashier, knowing that at the end of the 3 operations, the cash was zeroed.