Question

У Сережи столько двухрублевых монет, сколько и по 10 руб. Все монеты составляют сумму 60 руб.Сколько двухрублевых монет у Сережи

Answer 1

Х - количество монет (по 2 рубля и по 10 рублей). Тогда у Сережи всего 2х+10х или 60 рублей. Составим и решим уравнение:

2х+10х=60

12х=60

х=60612

х=5

Ответ: у Сережи 5 двухрублевых монет.

Answer 2

2х+10х=60

12х=60

х=60:12

х=5(м)- двухрублевых монет у Сережи

2*5+10*5=60

Answer 3

Solution:

Let's solve this problem step by step.

Step 1: Define the Variables - Let's assume the number of two-ruble coins as x and the number of ten-ruble coins as y.

Step 2: Formulate the Equations - We have two equations based on the given information: 1. The total value of the coins is 60 rubles: 2x + 10y = 60 2. The total number of coins is given by the sum of two-ruble and ten-ruble coins: x + y = 10

Step 3: Solve the Equations - We can solve the system of equations to find the values of x and y.

Step 4: Calculate the Number of Two-Ruble Coins - Once we have the value of x, we can determine the number of two-ruble coins.

Calculation:

Step 1: Define the Variables - Let's assume the number of two-ruble coins as x and the number of ten-ruble coins as y.

Step 2: Formulate the Equations - We have two equations based on the given information: 1. The total value of the coins is 60 rubles: 2x + 10y = 60 2. The total number of coins is given by the sum of two-ruble and ten-ruble coins: x + y = 10

Step 3: Solve the Equations - Using the substitution method, we can solve the system of equations: - From equation 2, we have: x = 10 - y - Substituting x in equation 1: 2(10 - y) + 10y = 60 - Simplifying the equation: 20 - 2y + 10y = 60 - Further simplification: 20 + 8y = 60 - Solving for y: 8y = 40, y = 5

Step 4: Calculate the Number of Two-Ruble Coins - Using the value of y, we can find the number of two-ruble coins: - x = 10 - y = 10 - 5 = 5

Answer:

- Sereja has 5 two-ruble coins.