500ml 95% alcohol, how much water to make 75% alcohol?

If this is a computational problem, then we must ignore the relationship between the alcohol concentration and its density (the higher the concentration, the lower the density)
500*95% = （500+x）*75
The solution is x = 133.4ml
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How to prepare 50% 70% alcohol with 95% alcohol

Junior high school chemistry knowledge
Yes, now we have 100g 95% alcohol, 100 * 95% = 95g pure alcohol
95 / 50% = 190g, that is to say, you need to add 95g of water. However, there is 5g of water, so you only need to add 90g of water to prepare it in this way

100 ml of water has 75% alcohol. How much water do you need to add to make 30% alcohol

How much alcohol is in it
75%*100/30%=250mL

How many grams of distilled water is needed to dilute 600 grams of 95% alcohol solution into 75% alcohol solution for disinfection?
If you want to write the solution in detail, you'd better indicate the reason and I'll offer you an extra reward

The mass of solute remained unchanged before and after dilution
The mass of alcohol in 600g 95% alcohol solution is 600 * 95% = 570g
After dilution, it is converted into 75% alcohol solution, and the solution mass is 570 / 75% = 760g
So the mass of water added = 760 - 600 = 160g

How many ml of water do you need to add to dilute 100 ml of 75% alcohol to 50% alcohol?
Formula! Better write it!

It should be 50 ml of water
100 ml of 75% alcohol, 75% of which is alcohol, that is 75 ml of alcohol, 25 ml of water,
To make 50% alcohol, the solvent divided by the total solution is 50%
Let X be the water to be added
100 ml of alcohol has 25 ml of water
75/75+25+x＝50％
x＝50ml

500ml 95% alcohol, how much water to make 75% alcohol?