Question

Решите Задачу! В коробке лежат синие и чёрные авторучки - всего 70 штук.Синих авторучек на 10 меньше, чем чёрных.Сколько чёрных авторучек в коробке?

Answer 1

(70-10):2=60:2=30 синих авторучек                                                                          30+10=40 черных авторучек

Answer 2

Problem Solving: Number of Black Pens in the Box

To solve this problem, let's break down the information given:

- There are a total of 70 pens in the box. - The number of blue pens is 10 less than the number of black pens.

Let's assume the number of black pens is represented by x. According to the information given, the number of blue pens would then be x - 10.

To find the value of x, we can set up an equation based on the total number of pens in the box:

x + (x - 10) = 70

Simplifying the equation, we get:

2x - 10 = 70

Adding 10 to both sides of the equation:

2x = 80

Dividing both sides of the equation by 2:

x = 40

Therefore, there are 40 black pens in the box.