## 226. Math Puzzle $3 / 84$

Sabine brings back 30 empty bottles, for which she receives $0.30 \mathrm{M}$ refund per bottle.

How many bottles of soda costing $0.30 \mathrm{M}$ each - for which she of course has to pay a deposit as well - could she buy again, and how much money, if any, would she have left over?
For 30 empty bottles, Sabine receives 9.00 Marks. For this, she gets 15 bottles of soda at 0.30 M + 0.30 M deposit.

If she sells these empty bottles again and the following ones as well, etc., she can obtain a total of 29 bottles of soda and keep a remainder of 0.30 M. If you lend Sabine one bottle, she can drink one more bottle and will certainly return the empty bottle to you.