Question

Если из числа жителей Жлобинского района вычесть 20% его, затем 25% остатка и ещё 14 2/7% следующего остатка, то в результате получится 18000 жителей. Сколько человек живет в Жлобинском районе?

Answer 1

Х- всего жителей
100-20=80%    80/100=0,8
100-25=75%   75/100=0,75
100-14 2/7=100-100/7=700/7-100/7=600/7%  600/7:100=6/7
х*0,8*0,75*6/7=18000
х*0,8*0,75*6/7=18000
х*3,6/7=18000
3,6х=18000*7
3,6х=126000
х=126000/3,6=35000-столько человек живет в Жлобинском районе

Answer 2

Solution to the Population Problem

To solve this problem, we'll follow the given steps and use the information provided to calculate the population of the Zhlobin district.

1. Calculate 20% of the total population and subtract it from the total population. 2. Calculate 25% of the remaining population and subtract it from the previous result. 3. Calculate 14 2/7% of the new remaining population and equate it to 18000 to find the total population.

Let's proceed with the calculations step by step.

Step 1: Calculate 20% of the Total Population

The first step is to calculate 20% of the total population and subtract it from the total population.

20% of a number can be found by multiplying the number by 0.20.

Step 2: Calculate 25% of the Remaining Population

After subtracting 20% of the total population, we'll then calculate 25% of the remaining population and subtract it from the previous result.

25% of a number can be found by multiplying the number by 0.25.

Step 3: Calculate 14 2/7% of the New Remaining Population

After the second subtraction, we'll calculate 14 2/7% of the new remaining population and equate it to 18000 to find the total population.

Let's proceed with the calculations to find the total population of the Zhlobin district.