The triangular region shows the number of possible ounces of gold, x, and the number of possible ounces of silver, y, a jewelry maker can mix together to make a certain piece of jewelry.

Y is vertical
x is horizontal
tis question basically is testing to see if you can read points to see if they are in a certain area

so

first one
12 and 20
go 12 right and 20 up
it is in the reigon

2nd one
16 and 30,
go 16 right and 30
it is not in the reigon, it is above

3
10 and 10
go 10 right and 10 up
it is on the line, not in the reigon

4
25 and 20
go 25 right and 20 up
it is out of the reigon

answer is
12oz gold and 20oz silver