A ball is thrown upward with a velocity of 20 metre per second calculate the maximum height reached by the ball and find the time it remain in the air
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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?
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