SOLUTION: There are 100 students in a school year group. On one day 99% of the students are present. Only 98% of the students with brown hair are present. How many of the 100 students have

Algebra ->  Equations -> SOLUTION: There are 100 students in a school year group. On one day 99% of the students are present. Only 98% of the students with brown hair are present. How many of the 100 students have       Log On


   

Question 949002: There are 100 students in a school year group. On one day 99% of the students are present. Only 98% of the students with brown hair are present. How many of the 100 students have brown hair? The answer is 50 but I don't know how! Can you tell me how the answer is 50 please?
Answer by macston(5194) About Me  (Show Source):
You can put this solution on YOUR website!
If 99% of 100 students were present, only one was missing. That one was 2% of the brown haired students, so:
(1/.02)=50 ANSWER: 50 of the 100 students have brown hair.