The mean marks (out of 100) of boys and girls in an examination are 70 and 73, respectively. If the mean marks of all the students in that examination is 71, find the ratio of the number of boys to the number of girls.
A
1:1
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B
2:1
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C
1:2
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D
2:3
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Solution
The correct option is A2:1 Let the total number of boys be x and the total number of girls br y.
Let the sum of the marks of boys be a and the sum of the marks of girls be b.