Question

Помогите пожалуйста сделать краткую запись к задаче В коробке лежат синие и черные авторучки-всего 70 штук. Синих авторучек на 10 меньше, чем черных. Сколько черных авторучек в коробке?

Answer 1

Всего 70
синих на 10 меньше
черных ?

Answer 2

Task Solution:

Let's solve the given problem step by step.

Step 1: Define the variables: - Let's assume the number of black pens as x. - The number of blue pens is 10 less than the number of black pens, so the number of blue pens is x - 10.

Step 2: Formulate the equation: - The total number of pens is 70, so we can write the equation as: x + (x - 10) = 70.

Step 3: Solve the equation: - Combining like terms, we get: 2x - 10 = 70. - Adding 10 to both sides, we get: 2x = 80. - Dividing by 2, we find: x = 40.

Step 4: Answer the question: - Therefore, there are 40 black pens in the box.

Final Answer:

There are 40 black pens in the box.