Question

Бабушка выпекает 8 пончиков за 1 минуту и кладёт их на тарелку.За это же время Боря и Петя съедают по 2 пончика каждый.а).Сколько пончиков останется на тарелке через 3 мин после наала выпечки?б).Сколько минут прошло с начала выпечки,если на тарелке осталось 20 пончиков?

Answer 1

А) (8-4)*3=12
Б)прошло 5 минут

Answer 2

А) 8*3-2*3
б) вот так а на это не знаю извини

Answer 3

Task Analysis

To answer the given questions, we need to calculate the number of donuts remaining on the plate after a certain number of minutes and determine the time elapsed since the start of baking based on the number of remaining donuts.

Answer

a) To calculate the number of donuts remaining on the plate after 3 minutes, we need to consider the rate at which the grandmother bakes the donuts and the rate at which Borya and Petya eat them.

The grandmother bakes 8 donuts in 1 minute, so in 3 minutes, she would have baked 8 * 3 = 24 donuts.

Borya and Petya eat 2 donuts each in 1 minute, so in 3 minutes, they would have eaten 2 * 3 = 6 donuts.

Therefore, the number of donuts remaining on the plate after 3 minutes would be 24 - 6 = 18 donuts.

b) To determine the time elapsed since the start of baking based on the number of remaining donuts, we need to work backward.

If there are 20 donuts remaining on the plate, we know that Borya and Petya eat 2 donuts each minute. Therefore, they would have eaten 2 * x = 20 donuts, where x is the number of minutes elapsed.

Solving for x, we find that x = 20 / 2 = 10 minutes.

Therefore, 10 minutes have passed since the start of baking.

Please let me know if you need any further assistance!