- 08
- 09
- 10
- 11
- a
-
Suppose,
Age of 3 Boys=3x+5x and 7z
According to Questions:
(3x+5x+7y)/3=15
15x/3=15
15x=15*3
15x=45
x=45/15
x=3
According to Question, the age of younger boys=3x
3x=3(3)=9
Mathematics MCQs
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Two members are in the ratio 3:4. If the sum of numbers is 63, the members are ____
- 30,33
- 23,40
- 55,12
- 27,36
- d
-
Sum of Two Ratios=3+4=7
Sum of Numbers=63
First Number=3/7*63=27
Second Number=4/7*63=36
Therefore, two numbers are 27 and 36.
If 16 men do a job in 20 days, then 32 men can do the same job in _____ days.
- 05
- 10
- 15
- 20
- b
-
16 men can do a job in 20 days
Total Work=16*20=320
Let 32 men do same job in X days
32x=320
x=320/32
x=10
Ages of two persons differ by 16 years. If 6 years ago, the elder one be 3 times as old the younger one, find their present age?
- 16,32
- 18,34
- 12,28
- 14,30
- d
-
Let the present age of one person be=x
Let the present age of second person be=x+16
6 Years ago age of elder person=x+16-6=x+10
Age of the younger person=x-6
According to the given statement:
x+10=3(x-6)
x+10=3x-18
10+18=3x-x
2x=28
x=28/2
x=14
Younger Age=14
Elder Age=14+16=30
Rauf is 6 feet tall and he notices that he casts a shadow that’s 5 feet long. He then measure that the shadow cast by the school building is 30 feet long, the height of the building in feet is _____
- 28
- 32
- 36
- 48
- c
-
Height of Rauf=6 feet
Shadow of Rauf=5 feet
Height of the building=X
Shadow of the building=30 feet
So, 6/5=X/30
5*X=6*30
5X=180
X=180/5
X=36
On selling a ball at Rs.720, there is loss of 10%. The cost price of the ball is:
- 750
- 800
- 850
- 900
- c
-
10% of 800
10/100*800=80
800-80=720
Actual Price of Ball is 800.
At Super Market Store everything is sold for 20% less than the price marked. If store owner buys radios for Rs.80, the price should he mark them if he wants to make 20% profit on his cost is _____
- 100
- 120
- 140
- 160
- b
-
Cost of Radio=80
20% of 80=20/100*80=16
Required Sale Price=80+16=96
20% of 120=20/100*120=24
120-24=96
If Display Amount is 20 then Amount with discount will be=120-24=96
In a Jar, 1/2 of the marbles are red, ¼ are white and 1/5 are blue. The fraction of the marbles that are not red, white and blue is _____
- 2/30
- 1/20
- 3/20
- 3/30
- b
-
Red=1/2
White=1/4
Blue=1/5
Total=1/2+1/4+1/5=(10+5+4)/20=19/20
Neither Red, Blue Nor White=1-19/20=(20-19)/20=1/20
If a car travels at an average speed 25meter/second, then the average speed in Km/h is _____
- 50 Km/h
- 60 Km/h
- 90 Km/h
- 100 Km/h
- c
-
Distance Covered in 1 Second=25 Meters
One Minute=60 Seconds
One Hour=60*60=3600 seconds
Distance Covered in One Hour=25*3600=9000 Meters
1000 Meters=1 Km
90000 Meters=90000/1000=90Km
The 70% of 50 is:
- 35
- 30
- 25
- 20
- a
-
70% of 50
70/100*50
35