Answer:
The unknown number is 3.
Explanation:
To get 17 from 19, we have to subtract 2.
2/3 of an unknown number gives us 2, and we can set up an equation to solve for the unknown number.
2/3x=2.
Divide both sides by 2/3 to isolate x. We get x= 2/2/3.
To simplify this fraction we can use "keep, change, flip."
2/ (2/3) goes to 2/1 x 3/2. 2/1 is kept, division is changed to multiplication, 2/3 is flipped to 3/2.
We can now multiply 2 by 3/2 to get 3 as the final answer and as our unknown variable.