"The Mystery of the Human Body" PPT Courseware 3

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"The Mystery of the Human Body" PPT Courseware 3

March 12th is Arbor Day. The school assigned the task of planting 42 saplings to three equal classes in the sixth grade. How should the distribution be reasonable?

equally distributed

Li Ming and Huang Hua jointly established a joint-stock food company. Li Ming invested 200,000 yuan and Huang Hua invested 300,000 yuan. After two years, the profit was 1.5 million yuan. How to distribute the profits reasonably?

In industrial and agricultural production and daily life, it is often necessary to distribute a quantity according to a certain ratio. This method of allocation is often called proration.

Definition of ratio

The composition of the ratio

Ratio, how to find the ratio?

The relationship between ratio and division

The relationship between ratio and fraction

Do you have any more questions?

Li Ming and Huang Hua jointly established a joint-stock food company. Li Ming invested 200,000 yuan and Huang Hua invested 300,000 yuan. After two years, the profit was 1.5 million yuan. How to distribute the profits reasonably?

Method one: Method two:

Solution: 20:30=2:3 20:30=2:3

Assume: Li Ming should be divided into 2x million yuan,

Huang Hua should be divided into 3x million yuan

2x + 3x = 150

5x = 150

X = 30

2x =60 3x = 90

Thought questions:

Xiao Ming is reading a book and has read 1/4 of the whole book.

If you read another 15 pages, the ratio of the number of pages read to the number of pages not read is 2:3. How many pages are there in this book?

An alcohol disinfectant is a mixture of water and ethanol at a ratio of 100-75. How many grams of ethanol are needed to prepare 1050 grams of this disinfectant?

Reasonable combination of breakfast

(1) What proportion did Xiao Ming use for breakfast today?

(2) Xiao Ming’s mother ate about 420g of breakfast according to the same ratio. Calculate how much each type of food her mother ate this morning.

Fill it out

1) Divide 20 small sticks into two piles in a ratio of 2:3, one pile of ____ sticks and the other pile of ____ sticks.

2) Divide 20 small sticks into two piles in a ratio of 1:1, one pile of ____ sticks and the other pile of ____ sticks.

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Update Time: 2024-10-05

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