Question

В киоски привели стержни для ручек:красные,зеленые и черные.красных стержней привезли 45,зелёных столько же,а черных на 18 меньше,чем зеленых и красных вместе.сколько черных стержней привезли в киоск?

Answer 1

1) 45-18= 27 (с.)- черных привезли в киоск.
2) (45+45)+27= 117(с.)- всего привезли в киоск.
Ответ: 117 стержней.

Answer 2

45+45=90 ( с ) - красных и зеленых вместе
90-18=72 ( с ) - Черных
Ответ. В киоск привезли 72 черных стержня . 

Answer 3

Problem Analysis

We are given that red, green, and black pen refills were brought to a kiosk. The number of red refills is 45, the number of green refills is the same, and the number of black refills is 18 less than the sum of red and green refills. We need to determine the number of black refills brought to the kiosk.

Solution

Let's denote the number of black refills as B. We know that the number of red refills is 45 and the number of green refills is the same. Additionally, we are given that the number of black refills is 18 less than the sum of red and green refills.

From the given information, we can write the following equations:

1. Number of red refills = 45 2. Number of green refills = 45 3. Number of black refills = (Number of red refills + Number of green refills) - 18

Let's solve these equations to find the number of black refills.

Calculation

Substituting the values from equations 1 and 2 into equation 3, we get:

Number of black refills = (45 + 45) - 18

Simplifying further:

Number of black refills = 90 - 18

Number of black refills = 72

Answer

Therefore, the number of black refills brought to the kiosk is 72.