Question

В первый день Незнайка съел 1/2 всех имеющихся у него пончиков. Во второй день-половину остатка, а в третий день-половину нового остатка и последние 5 пончиков. Сколько пончиков было у Незнайки вначале? варианты:30, 15, 40 , все ответы неверны, 10

Answer 1

1) 40:2=20
2) 20:2=10
3)10:2=5

Ответ:40

Answer 2

Calculation of the Number of Donuts

To determine the number of donuts that Neznayka had initially, we can follow the given information step by step.

1. On the first day, Neznayka ate half of all the donuts he had. 2. On the second day, he ate half of the remaining donuts. 3. On the third day, he ate half of the new remaining donuts and the last 5 donuts.

Let's calculate the number of donuts using the given information:

1. On the third day, Neznayka ate half of the new remaining donuts and the last 5 donuts. This means that the remaining donuts after the second day were 5 donuts. So, on the third day, he ate half of 5 donuts and the last 5 donuts, which means he ate a total of 10 donuts on the third day. 2. On the second day, Neznayka ate half of the remaining donuts. Since he ate 10 donuts on the third day, the remaining donuts after the second day were 10 donuts. 3. On the first day, Neznayka ate half of all the donuts he had. Since he ate 10 donuts on the second day, the initial number of donuts can be calculated by doubling that amount, which gives us 20 donuts.

Therefore, Neznayka had 20 donuts initially.