M A T H S M I N D S

What's your friend's phone number

Step 1:

Ask your friend to think of any number

Step 2:

Ask him to add the next number

Step 3:

Ask him to add 9

Step 4:

Ask him to divide with 2

Step 5:

Ask him to subtract the orginal number

Step 6:

Ask him to add his phone number and reveal the answer

Step 7:

Subtract 5 and tell him his phone number

Secret: Always he gets 5 when he subtracts his orginal number.

	Step 1:	Let your friend’s number be 9
	Step 2:	9 + 10 = 19
	Step 3:	19 + 9 = 28
	Step 4:	28 / 2 = 14
	Step 5:	14 – 9 = 9
	Step 6:	5 + 3007 = 3012
	Step 7:	3012 – 5 = 3007 (Phone No. 3007)
	Hence your friend’s phone number is 3007

Algebraic Explanation:

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