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OpenStudy (anonymous):
: Please help me solve this word problem I don't understand. Show an equation and a solution for the problem. Arnold needs a 25% solution of nitric acid. He has 20 ml of a 30% solution. How many ml of a 15% solution should he add to obtain the required 25% solution?
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OpenStudy (mertsj):
.3(20)+.15x=.25(20+x)
OpenStudy (mertsj):
30(20)+15x=25(20+x)
OpenStudy (mertsj):
600+15x=500+25x
OpenStudy (mertsj):
100=10x
OpenStudy (mertsj):
10=x
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OpenStudy (anonymous):
Thank you :D
OpenStudy (mertsj):
yw
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