Question

How many grams of cream that is 10% fat should a barista add to 120 grams of cream that is 20% fat mixture to get a 18% fat mixture

Answer 1

x = 30

Explanation:

10% fat = 0.1x

x = the solution, what we want to find

120 grams of 20% fat = 0.2 * 120

What we want is mixture of 18%

So....

0.1x + 0.2 * 120 = 0.18 (x + 120)

Solve:

0.1x + 24 = 0.18 (x +120)

0.1x + 24 = 0.18x + 21.6

24 = 0.08x + 21.6

x = 30