SOLUTION: 70% of a class scored at least 70 on a math test, of the remainig class 60% scored 60-69. What percent of the entire class scored less than 60%.

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: 70% of a class scored at least 70 on a math test, of the remainig class 60% scored 60-69. What percent of the entire class scored less than 60%.      Log On


   

Question 204140: 70% of a class scored at least 70 on a math test, of the remainig class 60% scored 60-69. What percent of the entire class scored less than 60%.
Answer by RAY100(1637) About Me  (Show Source):
You can put this solution on YOUR website!
Let x = total class.
.
1st group is 70% of x= .7x,,,,,remainder is (1-.7)x = .3x
.
2nd group is 60% of remainder,,,or .60*.3x = .18x
.
final remainder is ( 1-.7-.18)x = .12x ,,,(.3-.18=.12 also)
.
This is 12 % of original
.