The answer is 20 ounces. It can be solved by using alligation method. This is used when you want to make a solution, cream, etc. of a particular concentration by using ingredients with different concentrations.

75 | | 12

_____ | ___ | _____

| |

| 72 |

_____ | ___ | _____

| |

60 | | 3

You set up a tic tac toe grid (#hashtag). Put the concentration you are trying to make in the middle. On the left hand side, put the two concentrations you have on hand in the top and bottom squares. Then subtract on the diagonal, disregarding any negative numbers, and place those results in the respective boxes on the right hand of the grid

75 - 72 = 3

72 - 60 = 12

Now add the two numbers on the right hand side. 12 + 3 = 15

To find out how much of the 60% you need, you find 60 in the left hand box, go straight across to the number in the right hand box. In this case, that number is 3.

The equation is 3/15 * amount of solution you are trying to make 3/15 * 100 = 20 ounces

## Comments