I'm posting one puzzle, riddle, math, or statistical problem a day. Try to answer each one and post your answers in the comments section. I'll post the answer the next day. Even if you have the same answer as someone else, feel free to put up your answer, too!
Thursday, October 18, 2007
Common to Five
What number gives the same result when it is added to five as when it is multiplied by five?
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5/4 or 1.25.
ReplyDeleteX+5=y
X*5=y
X+5=5x
5=4x
x=5/4=1.25