Tuesday, 19 August 2008

Math Challenge 9

Think of a number (Keep the number to yourself).

Add five to it.

Multiply the total by two.

Subtract the original number twice.

Is the answer "TEN"?

Thinker: How is it done?

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2 comments:

  1. sourav12 July 2010 at 11:14 am

    Very Easy...xelect X instead of any no and then it will be very clear...

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  2. rara8 February 2011 at 10:38 pm

    yes, in connection to what sourav said, 2 have been distributed to the your number and to five:
    2(x+5) = 2x+10
    then subtract twice your number (2x) again from the resulting expression (2x+10).. leaving '10'

    2x+10-2x = 10

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