72% of 25 students are good at English.How many are not good at it?

Solution:  Let the no. of students in each row be x let the no. of rows be y therefore the total no. of students are  students in a row*no. of rows therefore the no....

Let H be the set of people who speak Hindi, and E be the set of people who speak English  ∴ n(H ∪ E) = 400, n(H) = 250, n(E) =...

Let U be the set of all students who took part in the survey. Let T be the set of students taking tea. Let C be the set of students...

Let U be the set of all students in the group.  Let E be the set of all students who know English.  Let H be the set of all students who know...

1 – 0.992 = 0.008

(i) Big families can be one of the reasons. Only small family gets good health and education unlike that of a large family. (ii) The Government has initiated the 'Hum do...

Let H be the set of people who speak Hindi, and E be the set of people who speak English ∴ n(H ∪ E) = 400, n(H) = 250, n(E) =...

Let U be the set of all students who took part in the survey. Let T be the set of students taking tea. Let C be the set of students taking coffee. Accordingly,...

Let U be the set of all students in the group. Let E be the set of all students who know English. Let H be the set of all students who know...

Let the side of the square be x. No. of students = x2 + 24 New side = x + 1 No. of students = (x + 1)2 – 25 APQ => x2 +...