Question

Ученик в первый день прочитал 25% всей книги, во второй-60% остатка, а оставшиеся часть книг в 3 раза.Сколько страниц книги, если во второй день ученик прочитал на 12 раз больше, чем в третий ?

Answer 1

100% - 60% = 40% - от остатка прочитано в третий день.
60% - 40% = 20% - на столько больше прочитано во второй день, чем в третий, что составляет 12 страниц.
12 : 20% · 100% = 60 (стр.) - прочитано за второй и третий день.
100% - 25% = 75% - от всей книги прочитано за второй и третий день, что составляет 60 страниц.
60 : 75% · 100% = 80 (стр.) - всего.
Ответ: в книге 80 страниц.

Answer 2

Problem Analysis

The problem states that a student read 25% of a book on the first day, 60% of the remaining part on the second day, and the remaining part of the book was read in three times as many pages as the second day. We need to determine the total number of pages in the book if the student read 12 times more pages on the second day than on the third day.

Solution

Let's assume the total number of pages in the book is x.

On the first day, the student read 25% of the book, which is 0.25x pages. On the second day, the student read 60% of the remaining part, which is 0.6(0.75x) = 0.45x pages. The remaining part of the book was read in three times as many pages as the second day, which is 3(0.45x) = 1.35x pages.

According to the problem, the student read 12 times more pages on the second day than on the third day. So, we can set up the following equation:

0.45x = 12(1.35x)

Let's solve this equation to find the value of x.

0.45x = 12(1.35x) 0.45x = 16.2x 16.2x - 0.45x = 0 15.75x = 0 x = 0 / 15.75 x = 0

The value of x is 0, which doesn't make sense in the context of the problem. It seems there might be an error in the problem statement or the given information. Please double-check the problem and provide the correct information so that we can help you further.

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