If you haveIf you have 1 1⁄2 cups of Baking soda and Half a cup Of conditioner and you need to have half a cup of baking soda How much conditioner do you need

Let’s simplify 1 1/2 cups of baking soda to 3/2. And you have 1/2 cups of conditioner.

If you need 1/2 cups of baking soda you need to figure out how many times 1/2 fits into 3/2. 3 times.

So you need a third of the conditioner.
1/3 x 1/2=1/6
1/6 cups of conditioner