SOLUTION: you need 25 ml 2% salt solution and you have 100 ml 5% salt solution. how much stock solution do you need? how much water?

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Question 643942: you need 25 ml 2% salt solution and you have 100 ml 5% salt solution. how much stock solution do you need? how much water?
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
you need 25 ml 2% salt solution and you have 100 ml 5% salt solution. how much stock solution do you need? how much water?
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let x=amt of 5% stock solution needed
25-x=water needed
5%x=2%*25
x=(2/5)*25=10
25-x=15
amt of 5% stock solution needed=10 ml
water needed=15 ml