The average height of 13 girls in a class is 144(8/13)cm. The average height of 11 boys in a class is 169(5/11)cm. There are only 24 student in the class. What is the overall average height (in cm) of all the students together in the class?
A 156
B 159
C 166
D 178
Solution
Correct Answer: Option A
total height of girls = 13 x 144(8/13) = 1880 cm
total height of boys = 11 x 69(5/11) = 1864cm
Average height of all the students, = (1880+1864)/24 = 156cm
অ্যাপ/ওয়েবসাইটে রুটিনভিত্তিক নিয়মিত লাইভ পরীক্ষা হচ্ছে।