Think of it this way: (1) This number is 1 time, three times is a number, three times more than 1 time, and two times more.

It is 1.8.

(2) The double quantity is 1.8, so we can find the double quantity 1 (this number).

The formula is: 1.8 ÷ (3- 1) = 0.9.

So, this number is 0.9. Verify the answer yourself.

I think you should understand!