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A and B can build a wall in 15 hours and 20 hours. If they work together they use 180 less bricks per hour and build the wall in 12 hours. Find number of bricks in wall.

A and B can build a wall in 15 hours and 20 hours. If they work together they use 180 less bricks per hour and build the wall in 12 hours. Find number of bricks in wall.

Grade:8

1 Answers

Vijay Mukati
askIITians Faculty 2590 Points
5 years ago
Dear Student,
Assume there are in total x bricks.
So, according to questoins , A will use x/15 bricks per hour and B will use x/20 bricks per hour.
Now we they work together, number of bricks per hour used by them will be (x/15+x/20 – 180) and these we can say that for 12 hours of work,
(x/15+x/20 – 180) * 12 = x.
Use these equation to find x.

Thanks.

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