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Numerical Ability
Averages
The average of boys in the class is twice the number of girls in the class. If the ratio of boys and the girls in the class of 36 be 5 : 1, what is the total of the ages (in years) of the boys in the class ?
a. 490
b. 196
c. 420
d. 360
Read Solution (Total 4)
-
- it will be 360
- 8 years agoHelpfull: Yes(1) No(0)
- The question is wrong... Correct the first sentence to "The average age of boys in the class is twice the number of girls in the class."
Solution:
5:1 ratio gives you 30 boys and 6 girls
average age of boys is twice girls: Therefore 12 with 12 being the average girls age as twice 6
The total age of the boys is 12 X 30 = 360 - 8 years agoHelpfull: Yes(1) No(0)
- as total students are 36.
so boys are 30
and girls are 6
as given in ques.
(total age)/30=2*6
by this
we gettotal age=360. - 8 years agoHelpfull: Yes(1) No(0)
- how is it 360??
- 8 years agoHelpfull: Yes(0) No(0)
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