Answers

2016-03-07T11:52:02+05:30
Suppose no. of girls be x, and no. of boys be y..... 
total score = 71*y + 73*x 
total no. of students= x+y 
avg. school score = total score / total no. of students 
=> 71*y + 73*x / x+y =71.8 
=> 71*y + 73*x = 71.8(x+y) 
=>73*x - 71.8*x = 71.8*y-71*y 
=> 1.2*x= 0.8*y 
=> x / y = 0.8 / 1.2 
=> x / y = 2/3 

SO THE RATIO IS 2:3
1 2 1
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