Question

В конкурсе "Кенгуру" в 2010г. приняло участие 1/20учеников школы, в 2011г. 3/20 учеников школы, а в 2012г. на 1/20 больше суммы учеников за два предыдущих года.Какая часть учеников приняла участие в конкурсе "Кенгуру" за три года ?Сколько учащихся приняло участие в конкурсе за три года вместе, если в школе учится 600 учеников?

Answer 1

Извините меня если будет неверно!
1)1/20+3/20=4/40(у)
2)4/40-1/20=3/20(у)
3)4/40+3/20=7/60(у)
4)600или - или делить незнаю ссори!

Answer 2

To find the answer to this question, we need to calculate the number of students who participated in the "Kangaroo" competition for each year and then determine the total number of students who participated over the three years.

Let's start by calculating the number of students who participated in each year:

- In 2010, 1/20 of the school's students participated. - In 2011, 3/20 of the school's students participated. - In 2012, the number of students who participated was 1/20 more than the sum of the students who participated in the previous two years.

To find the total number of students who participated over the three years, we need to add up the number of students for each year.

Let's calculate it step by step:

Calculation for 2010:

- Number of students who participated in 2010 = (1/20) * 600 = 30 students

Calculation for 2011:

- Number of students who participated in 2011 = (3/20) * 600 = 90 students

Calculation for 2012:

- Number of students who participated in 2012 = (1/20) * (30 + 90) = 6 students more than the sum of the previous two years. - Total number of students who participated in 2012 = (30 + 90) + 6 = 126 students

Now, let's calculate the total number of students who participated in the "Kangaroo" competition over the three years:

- Total number of students who participated = 30 + 90 + 126 = 246 students

Therefore, 246 students participated in the "Kangaroo" competition over the three years.

Now, let's calculate the fraction of students who participated in the competition over the three years:

- Fraction of students who participated = (Total number of students who participated) / (Total number of students in the school) - Fraction of students who participated = 246 / 600

To simplify the fraction, we can divide both the numerator and denominator by their greatest common divisor, which is 6:

- Fraction of students who participated = (246 ÷ 6) / (600 ÷ 6) = 41 / 100

Therefore, 41/100 or 41% of the students participated in the "Kangaroo" competition over the three years.

Please note that the calculations provided above are based on the information given in the question and may not reflect real-world data.