Aptitude - Average - Discussion
Discussion Forum : Average - General Questions (Q.No. 7)
7.
The average monthly income of P and Q is Rs. 5050. The average monthly income of Q and R is Rs. 6250 and the average monthly income of P and R is Rs. 5200. The monthly income of P is:
Answer: Option
Explanation:
Let P, Q and R represent their respective monthly incomes. Then, we have:
P + Q = (5050 x 2) = 10100 .... (i)
Q + R = (6250 x 2) = 12500 .... (ii)
P + R = (5200 x 2) = 10400 .... (iii)
Adding (i), (ii) and (iii), we get: 2(P + Q + R) = 33000 or P + Q + R = 16500 .... (iv)
Subtracting (ii) from (iv), we get P = 4000.
P's monthly income = Rs. 4000.
Discussion:
93 comments Page 2 of 10.
Thimoty said:
1 decade ago
Praveen you are answer is good.
Prabhjeet said:
1 decade ago
p+q=10100..........eq 1
q+r=12500.........eq 2
p+r=10400...........eq 3
subtracting 2 from 1 we get,
p+q-q-r=10100-12500
p-r=-2400.......eq 4
adding eq3 to eq 4
p-r+r+p=10100+(-2400)
2p=8000
p=4000
Rite ans.
q+r=12500.........eq 2
p+r=10400...........eq 3
subtracting 2 from 1 we get,
p+q-q-r=10100-12500
p-r=-2400.......eq 4
adding eq3 to eq 4
p-r+r+p=10100+(-2400)
2p=8000
p=4000
Rite ans.
Yazhini said:
1 decade ago
No confusion we can do like this
P + Q = (5050 x 2) = 10100
Q + R = (6250 x 2) = 12500
P + R = (5200 x 2) = 10400
We need only p so
p+q-(q+r)+p+r = p+q-q-r+p+r= 2P(cancel r and q)
10100-12500+10400=8000
2P = 8000
P = 4000.
P + Q = (5050 x 2) = 10100
Q + R = (6250 x 2) = 12500
P + R = (5200 x 2) = 10400
We need only p so
p+q-(q+r)+p+r = p+q-q-r+p+r= 2P(cancel r and q)
10100-12500+10400=8000
2P = 8000
P = 4000.
Sundarsac said:
1 decade ago
P + Q = (5050 x 2) = 10100 .... (i)
Q + R = (6250 x 2) = 12500 .... (ii)
P + R = (5200 x 2) = 10400 .... (iii)
the above three equation need not multiplied by 2 we can get without multiplying by 2(because its only short metod)
Q + R = (6250 x 2) = 12500 .... (ii)
P + R = (5200 x 2) = 10400 .... (iii)
the above three equation need not multiplied by 2 we can get without multiplying by 2(because its only short metod)
Swathi said:
1 decade ago
4 A secret can be told only 2 persons in 5 minutes. The same person tells to 2 more persons and so on. How long will take to tell it to 768 persons?
A) 47. 5 min b) 50 min c) 500 min d) 49 min.
Can anyone help me in finding the solution for this problem as soon as possible ?
A) 47. 5 min b) 50 min c) 500 min d) 49 min.
Can anyone help me in finding the solution for this problem as soon as possible ?
YESU BABU PAGIDIMALLA said:
1 decade ago
Income of p=5050+5200-6250
=10250-6250
=4000
=10250-6250
=4000
Amandha said:
1 decade ago
Praveen is wrong why means 8250-6250=2000 not 4000.
Sunil said:
1 decade ago
Please help me for this 8250-6250= 4000.
Sai kumar said:
1 decade ago
Simple method:
p+q+r=5050+5200=10250
we have to subtract q+r from it.. (ie)6250
10250-6250=4000 ans
p+q+r=5050+5200=10250
we have to subtract q+r from it.. (ie)6250
10250-6250=4000 ans
Samar said:
1 decade ago
p+q=5050
q+r=6250
p+r=5200
p+q+q+r+p+r=5050+6250+5200
2(p+q+r)=16500
p+q+r=16500/2
=8250
p+6250+8250
p=8250-6250
p=2000(Ans
A get the 2000Ans
How it comes 4000?
Please help me.
q+r=6250
p+r=5200
p+q+q+r+p+r=5050+6250+5200
2(p+q+r)=16500
p+q+r=16500/2
=8250
p+6250+8250
p=8250-6250
p=2000(Ans
A get the 2000Ans
How it comes 4000?
Please help me.
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