Prepare me a drink, buddy

Chemistry Level pending

Gather up, friends, to do some cool bits of physical chemistry.

Here's my question:

What volume of 75% Alcohol ( of density = 0.8 g/mL) must be used to prepare 150 mL of 30% Alcohol (of density = 0.9 g/mL)?

Nice and detailed solutions are very welcome!

And oh, I hope the title was a little funny. I'm not very good at those.


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