There are 100 students in class. The mean height of the class is 150 cm. If the mean hight of 60 boys is170 cm. Find the mean hight of the girls in the class.
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sum=100*150=15000
170*60+40*x=15000
40*x=4800
x=120
170*60+40*x=15000
40*x=4800
x=120
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