Question
In a class of 40 students, the average weight is 72 kg.
One student of weight 68 kg left and three new students with an average weight of 75 kg joined the class. When a teacher’s weight is also included, the average weight of the class becomes 74 kg. What is the weight of the teacher?Solution
Initial total weight of the class = 40 × 72 = 2880 kg
The sum of weight of 3 new students = 3 × 75 = 225 kg Let the weight of the teacher be ‘y’ kg.
New total weight of the class without teacher = 2880 - 68 + 225 + y = (3037 + y) kg
New total number of people = 40 - 1 + 3 + 1 = 43
New total weight of the class with teacher = 74 × 43 = 3182 kg
So, weight of the teacher = 3182 - 3037 = 145 kg
In a certain code language. 'RICE' is coded as '5136', 'FUR' is coded as '327', and 'FIN' is coded as '785'. How will 'FUN' probably be coded in that la...
A, B, C, D, E, F and G are sitting around a circular table facing away from the centre (but not necessarily in the same order). Only 3 people are sittin...
Select the set of classes the relationship among which is best illustrated by the following Venn diagram.
Select the correct mirror image of the given figure when the mirror is placed at MN as shown below.
If in a code language, 'Red' is called 'Green', 'Green' is called 'Pink', 'Pink' is called 'Brown', and 'Brown' is called 'Violet', then which coloured ...
What are the shortcut keys to paste the copied text?
Select the figure that will come next in the following series.
Which two numbers (not digits) should be interchanged to make the given equation correct?
(18 × 2) – 24 + 10 × 160 ÷ 16 + (10 × 4) = 170
If STRICTURE is coded as TSUTCIRER, then how would INCULCATE be coded?
L, M, N, O, P and Q live on six different floors of the same building. The lowermost floor in the building is numbered 1, the floor above it, number 2 a...
Relevant for Exams:
