Latest TCS Aptitude Question SOLUTION: If 75% of a class of 40 students can sing and only 20% cannot dance, the maximum number of students who can neither sing nor dance is a) 0 b) 6 c) 18 d) None of these

• Placement Papers
• /
• TCS
• /
• Numerical Ability
• /
• Percentage

TCS Question Papers: TCS Interview Experience(90) TCS Company Profile

(#M40011555) TCS Numerical Ability question Keep an EYE

If 75% of a class of 40 students can sing and only 20% cannot dance, the maximum number of students who can neither sing nor dance is
a) 0 b) 6 c) 18 d) None of these

Asked In TCS Subrat Baral (11 years ago)

Unsolved Read Solution (9)

Is this Puzzle helpful?   (15)   (6) Submit Your Solution Percentage

Read Solution (9) :

shivesh  (11 years ago)

i think it will be 8
as it is asked niether
so common terms will be taken..
ie 8

Is this solution Helpfull? Yes (11) | No (4)  

akram  (11 years ago)

75 % of 40 =30 thatss can sing ...
20% of 40 = 8 thats cannot dance ...
students who neither sing nor dance = 10+8 =18...

Is this solution Helpfull? Yes (10) | No (10)  

meghnad saha  (7 years ago)

Number of student that can sing is .75* 40 =30.
Then the number of student that can't sing is 40-30 = 10
Number of student that can't dance = 0.2* 40 =8.
Then the number of student that can dance is 40-8 =32.

Then the maximum number that can't neither song or dance are 10+8 = 18

Is this solution Helpfull? Yes (3) | No   

Adwitiya Samanta  (11 years ago)

it should be 6

Is this solution Helpfull? Yes (2) | No (7)  

RAHUL KUMAR  (11 years ago)

i guess 18 would be the answer...

Is this solution Helpfull? Yes (1) | No (4)  

Shiva  (10 years ago)

I think ans wil be d)
Let A is a event of can sing = (40*75)/100 = 30. so,P(A)=30/40=3/4.
Let B is a event of can dance= (40*(100-20))/100 = 32.so,P(B)=32/40=4/5.
now Student neither sing nor dance = P(AUB)'
1-P(A intersection B)=1 - P(A)P(B).[as both are independent events]
1-(3*4/4*5)=2/5.
so,ans is 40*2/5=16 students.

Is this solution Helpfull? Yes (1) | No   

yerra anitha  (7 years ago)

it is d.none of these
bcz out of 40 people 30 knows singing nd 8 people dont know dance for maximise the no dnace no singing we wil consider 8 people dnt know singing so finaly we get 8.ans is 8

Is this solution Helpfull? Yes (1) | No   

sonu kumar  (7 years ago)

75% of 40 can sing
i.e. 25% cannot sing
= 25/100 × 40 = 10 cannot sing

20% cannot dance i.e. 20/100 × 40 can not dance
= 8 can not dance

Total = 10+8 =18

Is this solution Helpfull? Yes | No   

venkata reddy  (5 years ago)

30 students know how to sing in that 8 students don't know how to dance but they can sing. Only 2 persons neither sing nor dance. answer is option d

Is this solution Helpfull? Yes | No   

Please Login to Read Solution.