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DIRECTIONS for the following four questions:
The proportion of male students and the proportion of vegetarian students in a school are given below. The school has a total of 800 students, 80% of whom are in the Secondary Section and rest equally divided between Class 11 and 12.
Solution
There are 640 secondary section students, 80 11th class students and 80 12th class students.
If the fraction of vegetarians in 12th class is x, then
80x + 80*0.5 + 640*0.55 = 0.53*800
=> x + 0.5 + 4.4 = 5.3 => x = 0.4
=> 40% are vegetarians in class 12.
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