Joshua Psalms T. answered • 05/07/16

Tutor

5
(5)
Civil EIT, Former College Professor of Mathematics (in Asia)

The fastest way to solve this is to not care about the percentage (concentration) first. Just look at the actual weight or volume that is being described.

18 (snack mix) + x (apricots that you don't know) = (18+x) (the new mixture)

18 + x = (18+x) ---> (duh right?)

Next, let's apply the concentration:

For the snack mix it's 20% apricots.

For the apricots that you gonna add, it's pure apricot therefore 100%.

And the desired concentration for the new mix is 25% apricots.

Multiplying the concentrations to their corresponding magnitudes:

18*(0.2) + x*(1.0) = (18+x)*(0.25) ----------- (you can actually use 20, 100 and 25 if you want, doesn't matter)

3.6 + x = 4.5 + 0.25x

0.75x = 0.9

**x = 1.2 ounces of apricots**