Question

average score of the 3/4 of the class is 80% of the class average. find the ratio of average score of the remaining class of that of entire class.​

Answer 1

Answer:

8:5

Step-by-step explanation:

Let the strength of the class, the average of the class and average of the remaining class be a,x,y respectively.

Sum of Marks of 3/4th of class = 3/4*a*0.8x

Sum of Marks of remaining class = 1/4*a*y

Sum of Marks of Entire class = a*x

(3/4*a*4x/5)+(1/4*a*y)= a*x

3x/5+y/4=x

y/x=8/5

The Required Ratio is 8:5