The average age of boys in the class is twice the number of girls in the class. If the ratio of boys and girls in the class of 36 be 5:1, what is the total of the ages of the boys?
A. 490
B. 196
C. 420
D. 360
E. 240
সঠিক উত্তরঃ
D.
360
Explanation:
Class Student = 36 So, Number of Girls= 1/6x36 = 6 So, Average age of boys = 6x2= 12 Class এ 6 জন ছাত্রী সুতরাং বাকি 36-6-30 জন ছাত্র So, Total Age of the boys- 30x12=360. Answer 360.
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