The average height of 75 students is 160cm. The mean height of boys is 172cm and that of girls is 152cm. Find the number of boys
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Answer:
Girls+Boys=75______(1)
Sum/number = average
(Girls*152+boys*172)/75=160
4(38 * Girls+ 43 * Boys) = 4 * 40 * 75_____(2)
Solving equation (1) and (2)
Girls = 45
Boys = 30
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