Question

How many grams of 2.5% hydrocortisone cream should be mixed with 360 g of 0.25% cream to make a 1% hydrocortisone cream?
a. 180 g
b. 200 g
c. 240 g

Answer 1

Let x = grams of 2.5% cream.

0.025x + 0.0025(360) = 0.01(x + 360)
0.025x + 0.9 = 0.01x + 3.6
0.015x = 2.7 → x = 180 g

Answer: a. 180 g