you have a 10% of a product and a 2% of the same product , you need 4 oz of this product but in a 5% strenght

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x = amount of 10% 4oz - x = amount of 2% .1x + .02(4-x) = .05(4) .1x + .08 - .02x = .2 .08x = .12 x = 1.5 so, 1.5 of 10% strength, and (4-1.5=2.5) 2.5 of 2% strength