Question

Решите задачи ДВУМЯ! ДВУМЯ! Способами! В книге 128 страниц.Юра прочитал 7/8 всех страниц. Сколько страниц ему осталось прочитать? И В школьном хоре 150 человек. 3/5 из них составляют девочки. Сколько в хоре мальчиков? ДВУМЯ! ДВУМЯ! ДВУМЯ СПОСОБАМИ!!!!!! Даю 15 балов!!!

Answer 1

128 Делим на 8 и получается 16 и 16 умножить на 7 и ответ 112 осталось прочитать 16 страниц.
150 делим на 5 и получится 30 узнаем девочек 30 умножить на 3 равно 90. 150-90=60 мальчиков 60

Answer 2

1й способ
1) 128 × 7/8 =112 стр - прочитал
2) 128 - 112 = 16 стр - осталось почитать
2й способ
1)всего страниц 1(единица )
1 - 7/8 = 8/8 - 7/8 = 1/8 - осталось прочитать - и это
2) 128 × 1/8 = 16 стр
1й способ
1)150 × 3/5 = 90 девочек
2)150 -90 = 60 мальчиков
2й способ
1) всего - 1 (единица)
1 - 3/5 = 5/5 - 3/5 = 2/5 - мальчики и это :
2) 150 × 2/5 = 60 .

Answer 3

Problem 1: Number of Pages Left to Read

To find out how many pages Yura has left to read, we need to subtract the number of pages he has already read from the total number of pages in the book.

Given: - Total number of pages in the book: 128 - Number of pages Yura has already read: 7/8 of all pages

To find the number of pages Yura has left to read, we can use the following formula:

Number of pages left to read = Total number of pages - Number of pages already read

Let's calculate it step by step:

Step 1: Convert the fraction 7/8 to a decimal. - 7/8 = 0.875

Step 2: Calculate the number of pages Yura has already read. - Number of pages already read = 0.875 * 128 = 112

Step 3: Calculate the number of pages Yura has left to read. - Number of pages left to read = 128 - 112 = 16

Therefore, Yura has 16 pages left to read.

Problem 2: Number of Boys in the School Choir

To find out how many boys are in the school choir, we need to calculate the difference between the total number of people in the choir and the number of girls.

Given: - Total number of people in the school choir: 150 - Proportion of girls in the choir: 3/5 of all people

To find the number of boys in the choir, we can use the following formula:

Number of boys = Total number of people - Number of girls

Let's calculate it step by step:

Step 1: Convert the fraction 3/5 to a decimal. - 3/5 = 0.6

Step 2: Calculate the number of girls in the choir. - Number of girls = 0.6 * 150 = 90

Step 3: Calculate the number of boys in the choir. - Number of boys = 150 - 90 = 60

Therefore, there are 60 boys in the school choir.

Alternative Method for Problem 1: Number of Pages Left to Read

Another way to solve the first problem is by finding the fraction of pages Yura has left to read.

Given: - Total number of pages in the book: 128 - Number of pages Yura has already read: 7/8 of all pages

To find the fraction of pages Yura has left to read, we can subtract the fraction of pages he has already read from 1 (since 1 represents the whole).

Step 1: Subtract the fraction of pages Yura has already read from 1. - Fraction of pages left to read = 1 - 7/8 = 1/8

Step 2: Calculate the number of pages left to read by multiplying the fraction by the total number of pages. - Number of pages left to read = (1/8) * 128 = 16

Therefore, Yura has 16 pages left to read.

Alternative Method for Problem 2: Number of Boys in the School Choir

Another way to solve the second problem is by finding the fraction of boys in the school choir.

Given: - Total number of people in the school choir: 150 - Proportion of girls in the choir: 3/5 of all people

To find the fraction of boys in the choir, we can subtract the fraction of girls from 1 (since 1 represents the whole).

Step 1: Subtract the fraction of girls in the choir from 1. - Fraction of boys = 1 - 3/5 = 2/5

Step 2: Calculate the number of boys in the choir by multiplying the fraction by the total number of people. - Number of boys = (2/5) * 150 = 60

Therefore, there are 60 boys in the school choir.

I hope this helps! Let me know if you have any further questions.