# Physical education classes to all students on a basketball training, everyone pitches 10 times, scor

2010-03-10 16:10:22 +0000 #1
scores the following table:

each scoring 1098 ... ... 210

the number of grade 12 3 ... ... 615

known to students in the class, at least three points in the average score of six points, scoring less than 8 points in the average score of three points, then the students in the class how many people have ?
2010-03-10 16:15:29 +0000 #2
The Class A total of 31 people

1: 34,567,891,062: 012,345,673

321 516

could be located in the class had 3.4.5.6.7 The number of points they are given X total score for the Y

has at least three points in the average score of 6 points with a score less than 8 points in the average score of 3 points

there are (10 +9 * 2 +8 * 3 + Y) / (X +1 +2 +3) = 6 (1 +12 + Y) / (X +1 +6 +5) = 3

solution was X = 13

then the total number of = 13 +1 +2 +3 + 6 +1 +5 = 31

You should be a junior high school students do not study math bar for a long time hope you can help