Phillip R. answered • 08/27/14

Top Notch Math and Science Tutoring from Brown Univ Grad

70 ml (.1) + x ml (.4) = (70 + x) .2

7 + .4x = 14 + .2x

.2x = 7

x = 7/.2 = 35 ml

Kelly W.

asked • 08/26/14that is 2% minoxidil. she has on hand 70ml of a 1% solution and wishes to add some 4% solution to obtain the desired 2% solution. how much 4% solution should she add?

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Phillip R. answered • 08/27/14

Top Notch Math and Science Tutoring from Brown Univ Grad

70 ml (.1) + x ml (.4) = (70 + x) .2

7 + .4x = 14 + .2x

.2x = 7

x = 7/.2 = 35 ml

SURENDRA K. answered • 08/26/14

An experienced,patient & hardworking tutor

Say, 4 percent solution is. = x ml

70ml solution is 1 percent

x. ml solution is. 4 percent

(70+x). ml solution is 2 percent

So,

70*1/100. +. 4x/100 =2(70+x)/100

70+4x=2(70+x)

2x =70

x=35 ml

So, 35 ml solution of 4percent

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