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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?


Let us keep total number of students as x  50%of students as x%2 and the remaining 50%as x%2  x%2=1%10+1%20+70=1403students total students =x%2+x%2=1403+1403=2806 no of students 10 years old =1%20 of 2806=1403 students are 10 years old
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