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a group of friends  goes for dinner and gets bill of Rs 2400 
. Two of them says that they have forgotten their purse so
remaining  make an extra contribution of Rs 100 to pay up
the bill. Tell the no. of  person in that group
 Question Submitted By :: General-Aptitude
I also faced this Question!!     Answer Posted By  
# 1
Let 'x' be the number of perons in the group and let 'y' be
amount per head which they have to pay.
Then xy = 2400.
or y = 2400/x
Since two friends have forget the purse, x-2 persons should
share the total amount(2400).
If they share, they have to make an extra contribution of
Rs 100 to pay up the bill
That is x-2 persons should pay y+100 each
or (x-2)(y+100) = 2400
or y+100 = 2400/(x-2)
or y = 2400/(x-2) - 100
Therefore we have got two equations namely,
y= 2400/x and y = 2400/(x-2) - 100
Comparing these two, we get
2400/x = 2400/(x-2) - 100
Solving this we get
x^2 - 2x -48 = 0
or (x-8) (x+6) = 0
or x = 8 or x = -6
Since 'x' denote the number of persons, it should be
So, x = 8.
Is This Answer Correct ?    106 Yes 1 No
# 2
8 persons 
Is This Answer Correct ?    61 Yes 2 No
# 3
if 'n' is the total no. of persons,
(1). for 2 persons in 'n' ,(n-2) of them have to pay a
total of (n-2)*100 in extra

(2) so for 'n' persons,(n-2) persons have to pay a total of
n(n-2)*100/2 = 2400
ie n(n-2)=48 =>n=8.
Is This Answer Correct ?    32 Yes 1 No
# 4
8 Persins.. 
Is This Answer Correct ?    25 Yes 6 No
# 5

Two forgotten to bring their purse=8-2=6
Is This Answer Correct ?    28 Yes 9 No
# 6
let the no.of persons=x
==> (x-8)=0 or (x+6)=0
finally either x=8 or -6
therefore the no.of persons = 8
Is This Answer Correct ?    5 Yes 3 No
# 7

ans:8 students
Is This Answer Correct ?    5 Yes 3 No
# 8
suppose 8 person goes for dinner and gets bill of 2400
each person gets 300
two of them forgotten purse
extra contribution 100 of 6 person

hence ans is 8 person
Is This Answer Correct ?    0 Yes 0 No
Nitin R
# 9
Is This Answer Correct ?    4 Yes 6 No
Sumit Kumar
# 10
by trail & error meathod

300 300 300 300 300 300 300 300

(300+100) (300+100)(300+100)(300+100) (300+100) (300+100)


ans 8 persons
Is This Answer Correct ?    1 Yes 4 No

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