Problem 1

-Soybean meal is 16% protein; corn meal is 9% protein. How many pounds of each should be mixed together to get a 350 pound mixture that is 12% protein?

And someone please check if I did this problem correctly....

The difference between two numbers is 11. Twice the smaller number plus three times the larger is 123. What are the numbers?

I got 90 and 101 is that correct?