Question

Составить схему к задаче в городе построили 57 девятиэтажных домов и 43 дома улучшенной планировки .Среди девятиэтажных 30 домов были домами улучшенной планировки .Сколько домов построили в городе?

Answer 1

Девятиэтажные дома - 57, в том числе 30 домов улучш. планировки
Дома улучшенной планировки - 43
Сколько домов всего?
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1) 57 - 30 = 27 (дом.) - обычные девятиэтажки;
2) 27 + 43 = 70 (дом.) - всего домов, построенных в городе.
Выражение: (57 + 43) - 30 = 100 - 30 = 70 
Ответ: 70 домов построили в городе.

 

Answer 2

Problem Analysis

To solve this problem, we need to determine the total number of houses built in the city. We are given that there are 57 nine-story houses and 43 houses with improved layouts. Additionally, we know that 30 of the nine-story houses have improved layouts.

Solution

To find the total number of houses built in the city, we can add the number of nine-story houses and the number of houses with improved layouts, and then subtract the number of nine-story houses with improved layouts.

Let's calculate it step by step:

1. Number of nine-story houses: 57 2. Number of houses with improved layouts: 43 3. Number of nine-story houses with improved layouts: 30

To find the total number of houses built in the city, we can use the following formula:

Total number of houses = Number of nine-story houses + Number of houses with improved layouts - Number of nine-story houses with improved layouts

Let's substitute the values into the formula:

Total number of houses = 57 + 43 - 30

Now, let's calculate the total number of houses:

Total number of houses = 70

Therefore, a total of 70 houses were built in the city.

Answer

A total of 70 houses were built in the city.