Question
The average height of each student in a class of 25
students is 150 cm. If 10 new students joined the class, then the average height of the each student in the class increases by 3 cm. Find the average height of 10 new students who joined the class.Solution
Total height of 25 students of the class = 150 × 25 = 3750 cm When 10 new students joined the class, average height of each student = 150 + 3 = 153 cm Total height of 35 students of the class = 153 × 35 = 5355 cm Average height of 10 new students who joined the class = {(5355 – 3750)/10} = 1605/10 = 160.5 cm
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