Sushi was thinking of a number. Sushi doubles it, then adds 20 to get an answer of 27.7 what was the original number

3.85

Step-by-step explanation

7.7 divided by 2 = 3.85

So if you double 3.85 you get 7.7 and then add 20 to 7.7 then you get 27.7

Let the number they are thinking of be X.

They double x , which would be 2x.

They then add 20, which would be 2x +20

So you have 2x + 20 = 27.7

Now we can solve for x:

Subtract 20 from both sides:

2x = 7.7

Divide both sides by 2:

x = 7.7 / 2

x = 3.85

The original number was 3.85