Question

Математика,4 класс,2 задачи. Белочка , зайчонок и оленёнок сделали лодку грузоподъемностью 30 кг. Масса белочки составляет 6% от массы зайчонка , а масса зайчонка равна 3 --- 25 (Три двадцать пятых) массы оленёнка.Могут ли они отправиться в путешествие по реке на своей лодке , если масса белочки равна 180 г. Фабрика получила заказ на пошив 168 платьев.Одна бригада может выполнить его за 28 дней , а другая - за 21 день. За сколько дней обе бригады выполнят заказ , если будут работать вместе?

Answer 1

Вторая задача:
1 фабрика 168/28=6 платьев вдень
2 фабрика 168/21=8 платьев в день
168/(6+8)=12 дней если будут вместе работать.

Вторая задача проценты смутили, но ладно.
Белка 180*100/6= 3000г (3 кг) вес Зайца.
Заяц 3000*(100* 3/25)= 36000 г это вес оленя.
итог 180+3000+36000=39180 г или 39,8 кг общий их вес, и как думаешь, смогут они уплыть?!
 

Answer 2

Problem 1: Mass of Squirrel, Bunny, and Fawn in a Boat

To solve this problem, we need to determine if the squirrel, bunny, and fawn can go on a river trip in their boat given their respective masses and the boat's weight capacity.

Given information: - Boat's weight capacity: 30 kg - Squirrel's mass: 6% of the bunny's mass - Bunny's mass: 3/25 of the fawn's mass - Squirrel's mass: 180 g

Let's break down the problem step by step:

1. Determine the mass of the bunny: - We are given that the squirrel's mass is 6% of the bunny's mass. - Let's assume the bunny's mass is x kg. - The squirrel's mass is then 6% of x kg, which can be written as 0.06x kg.

2. Determine the mass of the fawn: - We are given that the bunny's mass is 3/25 of the fawn's mass. - Let's assume the fawn's mass is y kg. - The bunny's mass is then 3/25 of y kg, which can be written as (3/25)y kg.

3. Calculate the total mass of the squirrel, bunny, and fawn: - The total mass is the sum of the squirrel's, bunny's, and fawn's masses. - Total mass = squirrel's mass + bunny's mass + fawn's mass - Total mass = 0.06x kg + (3/25)y kg + y kg

4. Check if the total mass is within the boat's weight capacity: - The boat's weight capacity is 30 kg. - If the total mass is less than or equal to 30 kg, they can go on the river trip. Otherwise, they cannot.

Let's solve the equations to find the answer:

1. Determine the mass of the bunny: - Given that the squirrel's mass is 180 g (0.18 kg), we have: 0.06x kg = 0.18 kg Solving for x, we get: x = 0.18 kg / 0.06 x = 3 kg

2. Determine the mass of the fawn: - Given that the bunny's mass is 3/25 of the fawn's mass, we have: (3/25)y kg = 3 kg Solving for y, we get: y = (3 kg * 25) / 3 y = 25 kg

3. Calculate the total mass of the squirrel, bunny, and fawn: - Total mass = 0.06x kg + (3/25)y kg + y kg - Substituting the values of x and y, we get: - Total mass = 0.06 * 3 kg + (3/25) * 25 kg + 25 kg - Total mass = 0.18 kg + 3 kg + 25 kg - Total mass = 28.18 kg

4. Check if the total mass is within the boat's weight capacity: - The boat's weight capacity is 30 kg. - Since the total mass (28.18 kg) is less than 30 kg, they can go on the river trip.

Therefore, the squirrel, bunny, and fawn can go on a river trip in their boat.