Question

Помогите решить домашку по математике!№613а)24а+47а+53а+76а,если а=47№615Прикаком значении z сумма 5z и 15z равна 840?№621Чтобы сделать казеиновый клей,берут 11 частей воды,5 частей нашатырного спирта и 4 части казеина (по массе).Сколько получится казеинового клея,если на него будет израсходовано нашатырного спирта на 60 г меньше,чем воды?С КРАТКОЙ ЗАПИСЬЮ!!!!!!!№624Из 523 цыплят,выведенных в инкубаторе,петушков оказалось на 25 меньше,чем курочек.Сколько курочек и сколько петушков было выведено в инкубаторе?

Answer 1

№613
24а+47а+53а+76а=200а
если а=47, то 200х47=9400

№615
5z+15z=840
20z=840
z=840:20
z=42

№624
х - курочки
(х-25) - петушки
х+(х-25)=523
2х=523+25
2х=548
х=274 - курочки
274-25=249 - петушки

Answer 2

Task 613a:

To solve the expression 24a + 47a + 53a + 76a, we need to substitute the value of a, which is given as 47.

Substituting a = 47 into the expression, we get: 24(47) + 47(47) + 53(47) + 76(47)

To simplify this expression, we can factor out 47: 47(24 + 47 + 53 + 76)

Now we can add the numbers inside the parentheses: 47(200)

Finally, we can calculate the value of the expression: 47 * 200 = 9400

Therefore, the value of the expression 24a + 47a + 53a + 76a, when a = 47, is 9400.

Task 615:

To find the value of z when the sum of 5z and 15z is equal to 840, we can set up the equation:

5z + 15z = 840

Combining like terms, we get: 20z = 840

To solve for z, we divide both sides of the equation by 20: z = 840 / 20

Simplifying the right side of the equation, we get: z = 42

Therefore, the value of z that satisfies the equation 5z + 15z = 840 is 42.

Task 621:

To find the amount of casein glue produced when 11 parts of water, 5 parts of rubbing alcohol, and 4 parts of casein are used, we need to determine the ratio of rubbing alcohol to water.

Given that the rubbing alcohol used is 60g less than the water, we can set up the equation:

5x = 11x - 60

Simplifying the equation, we get: 6x = 60

Dividing both sides of the equation by 6, we find: x = 10

Therefore, the ratio of rubbing alcohol to water is 5:11.

To find the amount of casein glue produced, we can use the ratio of 4 parts of casein to 11 parts of water. Since we have already determined that x = 10, we can multiply the ratio by 10:

4 * 10 = 40

Therefore, the amount of casein glue produced is 40.

Task 624:

Let's assume the number of chicks (kurochek) is x.

According to the problem, the number of roosters (petushkov) is 25 less than the number of chicks. Therefore, the number of roosters is x - 25.

The total number of chicks and roosters is given as 523. So we can set up the equation:

x + (x - 25) = 523

Simplifying the equation, we get: 2x - 25 = 523

Adding 25 to both sides of the equation, we find: 2x = 548

Dividing both sides of the equation by 2, we get: x = 274

Therefore, the number of chicks (kurochek) is 274, and the number of roosters (petushkov) is 274 - 25 = 249.