40% students in a school are more than 12 years of age while 90% of the students are below or equal to 15 years. 30% of the total students speak english. 30% of the students above the age of 15 speak English. Students below or equal to the age of 15 years who speak English is what % of the total students speaking English.
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the equation (l-m/2)x^2 -(l+m/2)x +m =0 got two values of x to satisfy the equation given as
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