| Author: bharath sudar 04 Jul 2008 | Member Level: Platinum | Rating:  Points: 6 |
Hi sithananthan.k
Answer:
5 years old
let boys age b x
sister’s = x/5
mother’s=5x
fatther’s=2(5x)
grandmother’s=81
81=x/5+x+5x+10x
81*5 = x+5x+ 25x +50x
405 = 81x
x= 405/81
x=5
so boys age is 5 years
With Regards,
BHARATH SUDAR
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| Author: ranganathan 04 Jul 2008 | Member Level: Gold | Rating: Points: 5 |
The answer is 5 because take sisters age as x then the boy's age will be 5x then the mother's age is 25x because it is five times the age of the boy and father's age is 50x twice that of mothers age so grand mothers age is 81 and which is equal to sum of sister, boy,mother and fathers age so x+5x+25x+50x=81 and by solving this we get sisters age is one and boys age as five and mothers age as twenty five and fathers age as fifty
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| Author: shakeel ahmed 04 Jul 2008 | Member Level: Gold | Rating: Points: 4 |
Let Boy's age be x years
So, his sister's age is x/5 years.
Mother's age is 5x and father's age is 10x.
Grandma's age is 81 years.
So,
x+x/5+5x+10x=81
16x+(x/5)=81 which gives x=5
The problem was pretty straight forward.
Hope to see more harder puzzles in the future...
thanks
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| Author: sithananthan.k 04 Jul 2008 | Member Level: Diamond | Rating: Points: 1 |
BOY AGE is 5 years , FINE BHARATH SUDAR , Explaination very clear for all,so good
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| Author: Syed 06 Jul 2008 | Member Level: Diamond | Rating: Points: 6 |
It's explained by bharath in a brilliant way, Good work bharath
Here is some more
http://209.85.135.104/search?q=cache:M86R9HezfSkJ:www.kcnit.ac.in/placement/php/paper/infosys/InfosysPlacementPaper21.doc+A+boy%E2%80%99s+age+is+5+times+as+old+as+his+sister.+His+father%E2%80%99s+age+is+twice+to+that+of+his+mother+who+is+five+times+as+old+as+the+boy.+The+sum+of+all+of+them+equals+to+that+of+his+grandmother+who+is+celeberating+his+81st+birthday.+How+old+is+the+boy%3F&hl=en&ct=clnk&cd=1&gl=ae
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