Question 1204843

Prepare 30% alcohol with a total volume of 100ml. How many mL of 90% alcohol should you add to 10% alcohol to make your final product of 30%? Please show work

Two strengths of alcohol are there ,90% and 10%

You want to prepare 100 ml of 30% alcohol

Let x ml of 90% alcohol  be added to prepare the   30% alcohol

10% alcohol will be (100-x)

90%x + 10%(100-x) = 100* 30%

=> 0.9x+0.1(100-x)= 100*0.3

=>0.9x+10-0.1x = 30

=> 0.8x+10=30

=> 0.8x =20

=> x= 25ml  (90% alcohol)
75 ml of 10% alcohol are required