What answer can be here?

Question

Mathematics

What do you think the answer here can be 27 or 28? Actually the task itself:
According to the tariff plan “Just like a day”, a cellular communication company withdraws 22 rubles from the subscriber's account every evening. If the account has less than 22 rubles left, then the next morning the number is blocked until the account is replenished. This morning, Lisa had 600 rubles in her account. How many days (including today) will she be able to use her phone without topping up her account?

Answer 1

If she had money in the morning in the range [22; 44), then she would be able to use the phone for exactly 1 day. Those. T = [M / 22] (round down). [600 / 22] = 27.