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