All the people are here, only Li Hong is late

All the people are here, only Li Hong is late

Change "all" to "other"

After Li Hong corrected her study method, her academic performance improved very quickly?

Correction -- change

The grade of class 41 is Li Hong

The best student in class 41 is Li Hong（

There are 7 green balls and 24 yellow balls in the bag. How many green balls can be added to make the ratio of green balls to yellow balls in the bag 5; 3

24 divided by 3 = 8 5 * 8 = 40-7 = 33

There are 160 red, yellow and white balls. If you take out 13 red balls, 14 yellow balls and 15 white balls, there are 120 left. If you take out 15 red balls, 14 yellow balls and 13 white balls, there are 116 left. How many red, yellow and white balls are there?

According to the above analysis, taking 160 △ 40 = 4 times just finished, red ball is still poor: 43-1 = 13, white ball is more than 1-45 = 15, yellow ball is finished; it shows that 13 of red ball is equal to 15 of white ball, the ratio of red ball to white ball is 3:5; according to the comparison of two schemes, it is found that 13-15 = 215 of white ball is more than 215 of red ball by 4; that is, white ball is more than red ball by 4 △ 215 = 30, so red ball has 30 △ 215（ 5-3) × 3 = 45; white ball has 45 + 30 = 75; yellow ball is 160-45-75 = 40; answer: (1) original yellow ball 40, (2) original red ball 45, white ball 75

There are three kinds of balls in the bag, among which red balls account for one fourth, white balls account for one fifth of the total number of red and yellow balls, and there are 100 red and white balls in total,
How many yellow balls are there

Analysis: from "white ball is one fifth of the total number of red ball and yellow ball", it can be concluded that white ball accounts for 1 / 6 of the three kinds of ball
1+5=6
100 ÷ (1 / 4 + 1 / 6) = 240
1--1/4--1/6=7/12
240x7 / 12 = 140
So there are 140 yellow balls

There are three red balls, four white balls and five yellow balls in one bag. Take 300 times in a row, and get white balls about () times

The probability of taking out the white ball each time is 4 / (3 + 4 + 5) = 1 / 3
300 × 1 / 3 = 100 times
Take 300 times in a row, get the white ball about (100) times

There are red, yellow and white balls in the pocket. There are four red balls and eight white balls. If the probability of finding a white ball is 3 / 1, how many yellow balls are there

There are 8 white balls. If the probability of finding a white ball is one third, then the total number of balls is 24. So the yellow ball should be 24-12 = 12

There are three kinds of balls in the box. The ratio of the number of yellow balls to the number of red balls is 2:3, and the ratio of the number of red balls to the number of white balls is 4:5?

The ratio of yellow, red and white spheres: (2 × 4): (3 × 4): (5 × 3) = 8:12:15, 8 + 12 + 15 = 35175 × 835 = 40, 175 × 1235 = 60, 175 × 1535 = 75; a: 60 red spheres, 40 yellow spheres and 75 white spheres

There are three kinds of balls in the box. The ratio of the number of yellow balls to the number of red balls is 2:3, and the ratio of the number of red balls to the number of white balls is 4:5
It's a formula

2：3=8：12
4：5=12：15
Yellow: Red: white = 8:12:15