Question

Аня,Таня и Ваня собирали марки о космосе.У Ани иТАНИ вместе 40 марок,у Тани и Вани 50 марок,а у Ани и Вани 70 марок о космосе.Сколько марок о космосе у Ани?

Answer 1

У Ани 30 марок 
у Вани 40 марок
у Тани 10 марок

Answer 2

1)50-40=10м.- у Тани
2)40-10=30м.- уАни
3)50-10=40м.- у Вани

Answer 3

Problem Analysis

We are given the information that Anya, Tanya, and Vanya collected stamps about space. The total number of stamps collected by Anya and Tanya together is 40, the total number of stamps collected by Tanya and Vanya together is 50, and the total number of stamps collected by Anya and Vanya together is 70. We need to determine how many stamps Anya has.

Solution

Let's assume the number of stamps collected by Anya is A, the number of stamps collected by Tanya is T, and the number of stamps collected by Vanya is V.

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

1. A + T = 40 (Equation 1) 2. T + V = 50 (Equation 2) 3. A + V = 70 (Equation 3)

To find the value of A, we can solve these equations simultaneously.

Adding Equation 1 and Equation 2, we get:

(A + T) + (T + V) = 40 + 50 A + 2T + V = 90 (Equation 4)

Subtracting Equation 3 from Equation 4, we get:

(A + 2T + V) - (A + V) = 90 - 70 2T = 20 T = 10

Substituting the value of T in Equation 1, we get:

A + 10 = 40 A = 30

Therefore, Anya has 30 stamps about space.

Answer

Anya has 30 stamps about space.