Achemist has a container of 12% peroxide solution and a container of 20% peroxide solution. she needs to mix the two solutions to create 100 ml of a 14% solution. if x represents the amount of 12% peroxide solution and y represents the amount of 20% peroxide solution she needs, which matrix equation can determine the amount of each solution she needs to make the 14% solution?

Step-by-step explanation:

We are given that,

The amount of 12% peroxide solution = x and the amount of 20% peroxide solution = y.

Since, the total amount of the solution to be made is 100 ml. So, the equation is

Also, the sum of the 12% solution and 20% of the solution is resulting in 14% solution. Then, the equation is

answer: all of the odd numbers were opened

the first person was the one that was opening all of the lockers. since one is odd, this causes all of the odd number lockers to be opened in the end.