


Number
& Math Play
The
Wall 


If the Jones twins can build a wall five bricks
long and five bricks high in 1 minute, how long
will it take them to build a wall ten bricks long
and ten bricks high?



The first wall has 25 bricks. The second wall has
100 bricks ? four times as many. So it will
take four times as long ? that is, four minutes.
Source: David Adler,Easy
Math Puzzles



