in a class test, the mean marks of boys and girls are respectively 42 and 45. if the mean marks of boys and girls are 44,then find the ratio of the number of boys to the number of girls.
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Answer: 1:2
Step-by-step explanation:
Let 'x' be the number of boys and 'y' be the number of girls.
To find the total marks
The total marks of boys = 42x
The total marks of girls = 45y
Total number of boys and girls = x + y
To find the ratio
The total marks of boys and girls = 44(x + y)
Then we can write
44(x + y) = 42x + 45y
44x + 44y = 42x + 45y
2x = y
x/y = 1/2
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