A) 27
B) 25
C) 40
D) 30
E) None of these
Correct Answer: D
Solution :
Let the no. of girls be x. The no. of boys is 45. Total age of boys and girls in the class \[=(x+45)\times 12.05\] Now, \[=(x+45)\times 12.05=45\times 11.75+x\times 12.5\] \[12.05x+542.25=528.75+12.5x\] or, 13.5 = 0.45x \[\therefore \]x=30 Quicker Method (By Allegations Method): \[\Rightarrow \]If there, are 45 boys then no. of girls = 30You need to login to perform this action.
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