SOLUTION: Thank you for helping me with this ALLOGATION MATH: word problem You have in stock a 30gram tube of 1% hydrocortisone cream and a 45 gram tube of 2.5% hydrocortisone cream and

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Question 814295: Thank you for helping me with this
ALLOGATION MATH: word problem
You have in stock a 30gram tube of 1% hydrocortisone cream and a 45 gram tube of 2.5% hydrocortisone cream and you need to prepare a 30 gram tube of 2% hydrocortisone. How much of each tube do you use to create this new concentration?

Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
a+b=30,
.01*a+.025*b=.02*30
a=10., b=20.
10 grams of 1% and 20g of 2.5%