Question 832357: THREE YEARS AGO NAVIN AND PAMMI HAD AN AVERAGE AGE OF 18YEARS.WITH SUBHA JOINING THEM NOW THEIR AVERAGE BECAME 22YEARS.WHAT IS SUBHA'S AGE NOW?
Found 2 solutions by stanbon, hovuquocan1997:
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! THREE YEARS AGO NAVIN AND PAMMI HAD AN AVERAGE AGE OF 18YEARS.WITH SUBHA JOINING THEM NOW THEIR AVERAGE BECAME 22YEARS.WHAT IS SUBHA'S AGE NOW?
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Equations:
(n-3 + p-3)/2 = 18
(n+p+s)/3 = 22
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Rearrange:
(n+p-6) = 36
n+p = 42
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Substitute and solve for "s":
(n+p+s) = 66
42+s = 66
s = 24 (Subha's age now)
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Cheers,
Stan H.
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Answer by hovuquocan1997(83) (Show Source):
You can put this solution on YOUR website! Let the age of Navin be x, the age of Pammi be y, and the age of Subha be z
Now you have, three years ago, means you will have x-3, and y-3
The average is 18, so your equation will be
Now you have x+y = 42
Now you have the average of x, y, and z are 22, so you have the equation:
But you have x+y = 42, so let's plug it in
TA-DAH
:D
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