Question

Для детского сада купили 20 пирамид больших по 7 колец и маленьких по 5 колец.у всех пирамид вместе 128 колец

Answer 1

This is a math problem that can be solved by using a system of linear equations. Let x be the number of big pyramids with 7 rings each, and y be the number of small pyramids with 5 rings each. Then we have two equations:

x + y = 20 (the total number of pyramids is 20) 7x + 5y = 128 (the total number of rings is 128)

To solve this system, we can use the substitution method. We can express y in terms of x from the first equation:

y = 20 - x

Then we can substitute this expression into the second equation:

7x + 5(20 - x) = 128

Simplifying and solving for x, we get:

7x + 100 - 5x = 128 2x = 28 x = 14

This means that there are 14 big pyramids and 20 - 14 = 6 small pyramids. To check our answer, we can plug these values into the original equations and see if they are true:

14 + 6 = 20 (true) 7(14) + 5(6) = 128 (true)

Therefore, the answer is correct. You can find more details and explanations on how to solve this type of problems in the web search results . I hope this helps you understand the solution.