Two-thirds of what number is 1?

1.5=3x0.5

2x0.5=1

So, 1 is 2/3 of 1.5

Two thirds of one is three halves of one.

$${\frac{{\mathtt{2}}}{{\mathtt{3}}}}{\mathtt{\,\times\,}}{\mathtt{n}} = {\mathtt{1}} = {\mathtt{n}} = {\frac{{\mathtt{3}}}{{\mathtt{2}}}}$$