A carpenter lays x bricks per hour for y hours and then lays x/2 bricks per hour for 2y more hours. In terms of x and y, how many bricks did he lay in total?
- 3xy
- 2xy
- 5xy
- None of these
Explanation
In the first y hours, the carpenter lays xy bricks.
In the 2y hours thereafter, he lays (x/2)(2y) = xy bricks.
Altogether, that's xy + xy = 2xy bricks.
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