The average mark scored by girls is 68 and that of boy is 62. The average marks of whole class is 64. What is the ratio of the boy and the girls in the class ?
Answers
Answer:
lol it's 2:3
Step-by-step explanation:
the most common answers are 1:1 , 1:2 , 2:3 , 3:5. where 2:3 is correct answer.
hope it helps
Given,
The average marks scored by girls = 68
The average marks scored by boys = 62
The average marks scored by whole calss = 64.
To Find,
The ratio of boys and girls in the class.
Solution,
Let the number of girls be x and number of boys be y
So,
Average marks of girls = Sum of marks scored by girls/x
68*x = sum of marks scored by girls.
Average marks of boys = sum of marks scored by boys/y
62*y = sum of marks scored by boys
Now,
Average marks of whole class = 64
Sum of marks scored by boys and girls/x+y = 64
(68*x+62*y)/x+y = 64
68x+62y = 64x+64y
4x = 2y
y/x = 2/1
Hence, the ratio of number of boys to number of girls is 2:1.