### Brain Teasers

# ** and ++

Math
Math brain teasers require computations to solve.

If 3**5 = 27 but 5**3 = 35

4++8 = 20 but 8++4 = 16

Then what is the result of (8**7)++9?

4++8 = 20 but 8++4 = 16

Then what is the result of (8**7)++9?

### Answer

The result is 106.For the operator **, you add 4 to the second number and then multiply, so a**b = a * (b + 4)

and a++b = a + (b * 2)

So therefore (8**7) ++9 = (8*(7 + 4)) ++ 9

= 88++9

= 88 + (9 *2)

= 88 + 18

= 106

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## Comments

i am first to add a comment mercenary!!! anyways love this teaser was challenging and dealt with numbers... but i didnt get it maybe next time

I got it without looking at the answer!!

Basically I was looking for a 9 to make 3 * 9 =27, so I tried adding 4 to the last number, and this worked for the other ** too.

Its slightly different for the ++, it only seems to work if you add the second number on again.

Good puzzle

Basically I was looking for a 9 to make 3 * 9 =27, so I tried adding 4 to the last number, and this worked for the other ** too.

Its slightly different for the ++, it only seems to work if you add the second number on again.

Good puzzle

To paraphrase Ford Prefect, I didn't stand a whelks chance in a supernova

Got it without even looking at the answer !!!

Cool one and keep them coming !!

Urs lovingly !

global

Cool one and keep them coming !!

Urs lovingly !

global

I got the rule for the ++, but I couldn't figure out the one for **. I realized that 3*9 was 27, but I never thought to add four to the five...oh, well...maybe next time!

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