The speech contest is divided into one, two and three prizes, among which the number of first and second prizes accounts for 5 / 8 of the total number of winners, and the number of second and third prizes accounts for less than 8 / 8 of the total number of winners A speech contest is divided into first, second and third prizes. Among them, the number of first and second prizes accounts for 5 / 8 of the total number of winners, the number of second and third prizes accounts for 7 / 8 of the total number of winners, and there are 8 second prizes. How many winners are there in this speech contest?

The speech contest is divided into one, two and three prizes, among which the number of first and second prizes accounts for 5 / 8 of the total number of winners, and the number of second and third prizes accounts for less than 8 / 8 of the total number of winners A speech contest is divided into first, second and third prizes. Among them, the number of first and second prizes accounts for 5 / 8 of the total number of winners, the number of second and third prizes accounts for 7 / 8 of the total number of winners, and there are 8 second prizes. How many winners are there in this speech contest?

Total = 8 ÷ (5 / 8 + 7 / 8-1)
=8÷(4/8)
=16 people
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In a competition, there are several winners of the first, second and third prizes. The winners of the first and second prizes account for 1 / 2 of the total number, and the winners of the second and third prizes account for 8 / 9 of the total number
What percentage of the total number of people who won the second and third prizes?

Suppose the number of first prize winners is x1, the number of second prize winners is X2, and the number of third prize winners is X3. Because the number of first and second prize winners accounts for 1 / 2 of the total number, X1 + x2 = X3; because the number of second and third prize winners accounts for 8 / 9 of the total number, X2 + X3 = 8 * (x1 + x2 + x3) / 9, then
9 * (x2 + x3) = 8 * (x1 + x2 + x3), then x2 + X3 = 8 * X1; at the same time, if 8 * X1 + 8 * x2 = 8 * X3, then x2 + X3 + 8 * x2 = 8 * X3, then 9 * x2 = 7 * X3. Let x2 = 7a, X3 = 9a, then X1 = 2A
So the second prize accounts for 7 / 18 of the total number, and the third prize accounts for 1 / 2 of the total number

In a competition, there are several first, second and third prizes. The first and second prizes account for 2 / 5 of the winners, the second and third prizes account for 9 / 10 of the winners, and the second prize accounts for a few points of the winners
How many points of the second prize

Because the first and second prizes account for 2 / 5 of the winners, the third prize accounts for 1 / 5 of the winners;
And because the second and third prizes account for 9 / 10 of the winners, deducting the third prize accounts for 1 / 5 of the winners, so the second prize accounts for 9 / 10-1 / 5 = 7 / 10

What percentage of the world's urban population in 2012?

In the 20th century, the world's urban population grew rapidly, from 220 million to 2.8 billion. In the next few decades, the urban population of developing countries will show unprecedented growth. This growth is especially obvious in Africa and Asia