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Q.
A class consists of both boys and girls along with a teacher. After a class, the teacher drinks 9 litres of water, a boy drinks 7 litres of water and a girl drinks 4 litres of water. If after a class 42 litres of water was consumed, find the number of girls in the class ?
A.
8
B.
6
C.
5
D.
3
View Answer
Correct choice: D
Explanation:
Given teacher drinks 9 ltr Let number of boys be 'A'. Let number of girls be 'B'. Boy drinks 7 ltr and girl drinks 4 ltr After class total water consumed = 42 ltr Then, 9 + 7A + 4B = 42 => 7A + 4B = 33 By trial and error method, The only integers which satisfy the equation is A = 3 and B = 3 Therefore, number of girls in the class = 3.
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