This year, 75% of a graduating class of harriet tubman high school had taken at least 8 math courses . Of the remaining class members, 60% had taken 6 or 7 math courses. What percent of the graduating class had taken fewer than 6 math courses? I would appreciate it if any1 can help with this.
2007-07-18 16:08:23 · 4 answers · asked by simbiat t 1 in Science & Mathematics ➔ Mathematics
Graduating class is g
75% have 8
remaining is 25% of g 60% of those have 6 or 7, which means that 40% of the remaining have fewer than 6.
so 40% of 25% of g have fewer than 6 or
.4(.25)g or .10g or 10% of the graduating class have 6 or fewer.
That means
75% have 8 or more
15% have 6 or 7
10% have fewer than 6
2007-07-18 16:14:52 · answer #1 · answered by gordonmorrison 6 · 0⤊ 0⤋
After the first 75% is taken out, you are left with 25%. You now have to take away 60% of that.
60% of 25% = .6*.25 = .15 = 15%
25% - 15% = 10% of the entire class took fewer than 6 math courses.
2007-07-18 23:15:44 · answer #2 · answered by answerswelcome 1 · 1⤊ 0⤋
class = 100
75 have taken at least 8 math courses
60% of 25 students have taken 6 or 7 course
leaving 15 students out of 100 that have taken less than 6 math course
giving you 15%
-edit oops... they're right its 10%
2007-07-18 23:12:03 · answer #3 · answered by Wallyman 2 · 0⤊ 1⤋
100 - 75 - 0.6 * (100 - 75) = .....
2007-07-18 23:13:41 · answer #4 · answered by oregfiu 7 · 0⤊ 0⤋