SOLUTION: In a school 50% of the students are younger than 10, 1/20 are 10 years old and 1/10 are older than 10 but younger than 12, the remaining 70 students are 12 years or older. How many

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Question 848652: In a school 50% of the students are younger than 10, 1/20 are 10 years old and 1/10 are older than 10 but younger than 12, the remaining 70 students are 12 years or older. How many students are 10 years old?

Answer by rvfer(117) About Me  (Show Source):
You can put this solution on YOUR website!
0.50 younger than 10
0.05 are 10
0.10 older than 10 but younger than 12
70 students 12 or older
How many are 10 yrs old?
0.50+0.05+0.10=0.65=65%
70 are 35%
70/0.35=200 total
200*0.05=10 students ten yrs old