Downsizing baby formula

Question

I couldn't find a stack exchange for babies, so here goes. We mix ten scoops of formula into 150ml of water to get 200ml of milk. What is the combo I need to make 150ml of milk?

I tried mixing 7.5 scoops with 112.5 ml of water and it still comes out to around 180ml of milk after many tries.

Not sure what laws of mathematics or physics is at work here.

Answer 1

Simple solution:

• Take 112.5 ml of water
• Slowly start adding the formula to the water, and measure the volume after each scoop
• When the volume is the desired amount (150 ml), stop adding

And ta-da, you have 150 ml of milk!