Question

Нам по матеше дали задание:Сделать 2 задачи с процентами помогите только с сайтов и книжек/учебников не воровать окей?(5 Класс)

Answer 1

Организм взрослого человека  состоит на 70% из  воды   воды.Какого масса воды в теле человека,который весит 89кг?
1)89:100 =0,89(кг)- 1% от массы человека.
2)0,89*70=62,3(кг)-масса воды в теле человека.
Ответ:62,3кг.

Answer 2

Percentage Problems for 5th Grade Math

Let's solve two percentage problems suitable for 5th grade math.

Problem 1: Finding the Percentage Suppose you have a bag of 80 marbles, and 20% of them are red. How many marbles are red?

Solution: To find the number of red marbles, we can use the formula: \[ \text{Number of red marbles} = \frac{\text{Percentage in decimal form} \times \text{Total number of marbles}}{100} \]

Substituting the given values: \[ \text{Number of red marbles} = \frac{20 \times 80}{100} = 16 \]

So, there are 16 red marbles in the bag.

Problem 2: Calculating the Total Amount If a shirt originally costs $40 and is on sale for 25% off, what is the sale price of the shirt?

Solution: To find the sale price, we can use the formula: \[ \text{Sale price} = \text{Original price} - \left( \frac{\text{Percentage in decimal form} \times \text{Original price}}{100} \right) \]

Substituting the given values: \[ \text{Sale price} = 40 - \left( \frac{25 \times 40}{100} \right) = 40 - 10 = $30 \]

So, the sale price of the shirt is $30.