- 27
- 45
- 150
- 270
- d
-
Sum of Observations=x
No of Observations=06
Mean=Sum of Observations / No of Observations
Mean=x/6
45=x/6
45*6=x
270=x
Mathematics MCQs
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The mean of 100 items was found to be 30. If at the time of calculation, two items were wrongly taken as 32 and 12 instead of 23 and 11. Then correct mean is _____
- 29.8
- 29.9
- 30.0
- 30.1
- B
In 1 Kg mixture of sand and iron, 20% is iron. How much sand should be added so that proportion of iron become 10%.
- 200 gms
- 500 gms
- 1 Kg
- 1 Ton
- C
-
1 Kg=1000 g
Amount of Iron in mixture=20% of Sand
20/100*1000=200 g
Amount of Sand=1000-200=800g
Let the sand added “x”
Iron=10/100(1000+x)
200=1/10(1000+x)
2000=1000+x
2000-1000=x
1000=x
9% of 64+32% of 90=?
- 34.56
- 40.56
- 55.52
- 25.26
- a
-
9% of 64 = 9/100*64=5.76
32% of 90=32/100*90=28.8
5.76+28.8=34.56
In an examination, 65% of the total examines passed. If the number of failures is 420, the total number of examines is_____
- 500
- 1500
- 1200
- 1800
- C
-
Let total examines is X
65% examines has passed
Failed examines=100-65=35%
Number of Failures= 420
35% of X = 420
35/100* X=420
X=420*100/35
X=1200
How is ½% expressed as a decimal fraction?
- 0.005
- 0.05
- 0.5
- None of these
- a
-
1/2 %
1/2*1/100
1/200
0.005
The ratio of A’s and B’s salary is 9:4. If A’s salary is increased by 15%, then his total salary becomes Rs.5175. What is the salary of B?
- Rs.4000
- Rs.3000
- Rs.2000
- Rs.1000
- C
-
Let the salaries of A & B= 9x & 4x
What is 15% of A Salary=?
15/100*9x=27/20x
Now, The salary of A
9x + 27/20 x=5175
(180x+27x) / 20=5175
207x/20=5175
207x=5175*20
207x=103500
x=103500/207
x=500
The salary of B is =4x
4x=4 (500)
B=2000
The mean proportion of 0.25 and 0.04 is _____
- 0.1
- 0.01
- 0.01
- None of these
- a
-
0.25 : x :: x : 0.04
x*x=0.25*0.04
x2=0.01
(Square Root of both sides)
X=0.1
What number has to be added to each term of 3:5 to make the ratio 5:6?
- 05
- 06
- 07
- 08
- c
The ratio of the age of the two students is 3:2. One is older than the other by 5 years. What is the age of the younger student?
- 10 Years
- 15 Years
- 02 Years
- None of these
- a