Question

При сушке грибы теряют 85 %своей массы . Сколько надо взять свежих грибов чтобы получить 48 кг сушенных 2) маятник стенных часов делает 364 качаний за 7 минут . Сколько качаний он сделает за полчаса ? 3) посевная площадь возросла с 30 га до 37,5 га на сколько процентов возросла посевная площадь 4) было отремонтировано 29%всех стаканов цеха после чего осталось еще 142 станка . Сколько стаканов в цехе

Answer 1

1)100 - 85  = 15% - сушеных грибов с 1 кг
2) 15% = 0,15 48:0,15 = 320 (кг) - свежих грибов надо взять, чтобы получить 48 кг сушеных

364:7*30 = 1560 (качаний) - за полчаса

Составим пропорцию
30га - 100%
37,5 га - х%
х = (37,5*100):30
х =3750:30
х = 125
Новая площадь 125 %
125 - 100 = 25% 
Ответ: на 25 %

100-29 = 71% - оставшиеся станки
142:71*100 - 200 (станков) - всего в цехе

Answer 2

1- 300 кг , 2- 1560 качаний , 3- 20 процентов , 4 - 200 станков

Answer 3

1) To calculate the amount of fresh mushrooms needed to obtain 48 kg of dried mushrooms, we can use the fact that mushrooms lose 85% of their weight during the drying process.

Let's assume x represents the weight of fresh mushrooms needed.

The equation can be set up as follows:

x - 0.85x = 48 kg

Simplifying the equation:

0.15x = 48 kg

Dividing both sides by 0.15:

x = 48 kg / 0.15

Calculating the value:

x = 320 kg

Therefore, you would need 320 kg of fresh mushrooms to obtain 48 kg of dried mushrooms.

2) If a pendulum of a wall clock makes 364 swings in 7 minutes, we can calculate how many swings it will make in half an hour.

Let's assume y represents the number of swings the pendulum will make in half an hour.

The equation can be set up as follows:

364 swings / 7 minutes = y swings / 30 minutes

Simplifying the equation:

(364 swings * 30 minutes) / 7 minutes = y swings

Calculating the value:

y = (364 * 30) / 7

y ≈ 1560 swings

Therefore, the pendulum of the wall clock will make approximately 1560 swings in half an hour.

3) To calculate the percentage increase in the sown area from 30 hectares to 37.5 hectares, we can use the following formula:

Percentage increase = ((New value - Old value) / Old value) * 100

Let's calculate the percentage increase:

((37.5 ha - 30 ha) / 30 ha) * 100 ≈ 25%

Therefore, the sown area increased by approximately 25%.

4) If 29% of all the glasses in the workshop were repaired and there are still 142 machines left, we can calculate the total number of glasses in the workshop.

Let's assume z represents the total number of glasses in the workshop.

The equation can be set up as follows:

(100% - 29%) * z = 142 glasses

Simplifying the equation:

0.71z = 142 glasses

Dividing both sides by 0.71:

z = 142 glasses / 0.71

Calculating the value:

z ≈ 200 glasses

Therefore, there are approximately 200 glasses in the workshop.