April 30, 2012

Can you explain this worksheet?


My son brought home a math worksheet with this problem on it:

Clue 1: I am greater than 15 and less than 40.
Clue 2: If you double me, I become a number that ends in 0.
Clue 3: 1/5 of me is equal to 5.

This might be a fun group game, but I'm not sure of the value of this worksheet. 

So, math people, help me out. Why would my son or anyone else ever need to know the answer to the above problem?