A couple of easy math brain teasers
Some days ago I received an internal newsletter containing a couple of easy math brain teasers. I aready solved them so am going to show them here, without the answers obviously because they are pretty easy.
1) Can you take the numbers 21, 10, 5, and 3 and make the total equal 24 using basic arithmetic signs (*, /, +, -)? Each number may must only be used once, and every number must be used.
For example, if given 2, 2, 4, and 6 the answer would be
6/2 = 3
3*2 = 6
6*4 = 24
2, 2, 4, and 6 were all used once.
2) If it takes a man one hour to dig a hole two meters long, two meters wide, and two meters deep, how long would it take the same man to dig a hole four meters long, four meters wide, and four meters deep, assuming he digs at the same rate of speed?
