81.
A certain factory employed 600 men and 400
women and the average wage was Rs. 25.50 per day. If a woman got Rs. 5 less
than a man, then what are their daily wages?
a)
Man: Rs. 25; woman : Rs. 20
b)
Man : Rs. 27.50, woman: Rs. 22.50
c)
Man: Rs. 30, woman : Rs. 25
d)
Man: Rs. 32.50, woman: 27.50.
82.
The arithmetic mean of the scores of a group of
students in a test was 52. The brightest 20 % of them secured a mean score of
80 and the dullest 25% a mean score of 31. The mean score of remaining 55% is:
a)
45
b)
50
c)
51.4 approx.
d)
54.6approx.
83.
The average salary of all the workers in a
workshop is Rs. 8000.Thhe average salary of 7 technicians is Rs. 12000 and the
average salary of the rest is Rs. 6000. The total number of workers in the
workshop is:
a)
20
b)
21
c)
22
d)
23
84.
In a school with 600 students, the average age
of the boys is 12 years and that of the girls is 11 years. If the average age
of the school if 1 years 9 months, then the number of girls in the school is:
a)
150
b)
250
c)
350
d)
450
85.
In an examination, a pupil’s average marks were
63 per paper. If they had obtained 20 more marks for his Geography paper and 2
more marks for his History paper, his average per paper would have been 65. How
many papers were there in the examinations?
a)
8
b)
9
c)
10
d)
11
e)
12
86.
The average age of students of a class is 15.8
years. The average age of boys in the class is 16,.4 years and that of the
girls is 15.4 years. The ratio of the
number of boys to the number of girls in the class is
a)
1: 2
b)
2:3
c)
3:4
d)
3:5
ANSWERS
