Yaneev thinks of a number He subtracts three from the number, then doubles it. Then he subtracts three again, and doubles the number again. The result is his original number What is ?

weredumbmaster22 Sep 11, 2021

#2**+1 **

*Yaneev thinks of a number He subtracts three from the number, then doubles it. Then he subtracts three again, and doubles the number again. The result is his original number What is ?*

Let X represent the original number.

X = {[(X – 3) • 2] – 3} • 2

Let me see if I can multiply that out without getting lost. One step at a time.

X = [(2X – 6) – 3] • 2

X = 4X – 12 – 6

3X = 18

**X = 6**

check answer:

6 minus 3 is three. 3 doubled is 6. 6 minus 3 is 3. 3 doubled is 6. Looks correct.

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Guest Sep 12, 2021