A student scored an average of 80 marks in 3
subjects: Physics, Chemistry and Mathematics. if his average marks in Physics
and Mathematics is 90 and that in Physics and Chemistry is 70, what is the
marks in Physics? .
The average monthly income of X and Y is
Rs.15000, that of Y and Z is Rs.16600 and that of X and Z is Rs.15400. Find the
average monthly income of X, Y and Z. .
(a) Rs.15666.67 .
(b) Rs.23500 .
(c) Rs.19500 .
A group consists of 11 men. If two men whose
ages are 29 years and 31 years are replaced by two other men named Ravi and Rajesh,
the average age of the group drops by one year. Find the average age of Ravi
and Rajesh (in years). .
(a) 22.5 .
(b) 23.5 .
(c) 24.5 .
(d) 25.5 .
The average marks of the students of a class
in an exam was 60. Had the average marks of 40 of these students been 70
instead of 50, the average marks of the class would have been 62. Find the
number of students in the class. .
In a shooting tournament. 70 archers
initially participated. Their average number of points is 36. if 20 archers who
joined initially and whose average number of points is 40 are excluded and 30
other archers who joined later and whose average number of points is 30 are
included, find the average points of the new group. .
(a) 22.4 .
(d) 32.75 .
The average weight of a group of 30 girls was
94.6 kg. One of these girls weighed 98 kg. Had her weight been 89 kg, the
average weight of the group would have been .
(a) 94.9 kg .
(b) 94.8 kg .
(c) 94.4 kg .
(d) 94.3 kg .
The students of section A and section B of a
class have average weights of 30 kg and kg respectively. Find the average
weight of both the sections together given that the number of students in the
sections A and B are in the ratio 9 : 1. .
(a) 34.5 kg .
(b) 33 kg
(c) 31.5 kg .
(d) 36 kg
In a certain company, there are two
departments P and Q. The average salary of the employees in both the departments
together is Rs.7000. The average salary of the employees in P is Rs.6000, and
that in Q is Rs.12000. The total number of employees in P and Q together is 48.
Find the number of employees in Q. .
The average score of a class of 32 students
in a test was 40. When the scores of the top three students were not
considered, the average score of the class was found to be 38. Find the average
score of the top three scorers. .
Two solutions A and B having 30% milk and 80%
milk are mixed to form a mixture which contains 50% milk. Find the ratio of the
quantities of A and B mixed. .
(a) 4 : 1
(b) 3 : 5
(c) 5 : 2
(d) 3 : 2