Question
The total number of students in class A and B is 72. The
number of students in A is 40% more than that in B. The average marks of students in B are 50% more than that of students in A. If the average marks of all the students in A and Bare 58, then what are the average marks of students in A?Solution
Let the number of students in class B is x then the number of students in class A will be = 1.4x Let the average marks of students in class A is y then the average marks of students in class B will be = 1.5y Now given, average of both the class is 58. Thus, (1.4x × y + x ×1.5y)/(x+1.4x) =58 1.4y +1.5y =58×2.4 y = (58×2.4)/2.9 =48.
Which of the following property of soil can’t be changed by any means?
Which type of layer silicate clay minerals demonstrates a structure comprising two silica tetrahedral sheets and two magnesium-dominated tri-octahedral ...
In which soil order is cryopedoturbation, a frost churning process resulting from the freezing and thawing of soil material, predominantly observed?
Which soil property is least affected by the size and arrangement of soil particles?
Flooding is the method used for the reclamation practice in which of the problematic soil?
The acidic soils can be reclaimed by the application of ____
Which of the following element/substance leads to deflocculation of soil particles?
Which of the following groups of nutrients is absorbed by plants only in anionic form?
In water logged soils maximum microbes found are
The element which becomes deficit in acidic conditions ___
