Latest Patni Aptitude Question SOLUTION: A make a wall in 9 hour. B makes a wall in 10 hour. When doing together 10 more bricks are required and together make a wall in 5 hour. How many bricks r there in the wall?

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A make a wall in 9 hour. B makes a wall in 10 hour. When doing together 10 more bricks are required and together make a wall in 5 hour. How many bricks r there in the wall?

Asked In Patni (12 years ago)

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Pargat Pal Singh  (12 years ago)

190 bricks are there in the wall.
Time taken by Aand B together to complete same brick job = 1/(1/9 +1/10) = 90/19 hrs.

Actual time taken = 5 hrs

extra time taken for 10 bricks job = 5-90/19 = 5/19 hrs

so 5/19 hrs are reqd for 10 bricks
5 hrs are reqd for 190 bricks.

so initially 180 bricks were reqd.
Finally 190 bricks are used.

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