160479

Number-5
Add 3-
Double-16
Add 4-20
Halve- 10
Take away the number you started with- 5

So, you see how you add 3 and you also add 4. Well, the answer is always 5 because there is +3 and +4.
You add 3
Then double it =6
Then you have to add 4. 6+4=10
Then you divide it by 2. 10 divided by 2 is 5
This is how you get 5.
So when you minus it by the original number it takes that away so there is only 5 left.