Pls help me i will give brainliest

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

Can anyone me with this question?

The equation y equals 11 x represents the calories jake burns when cross country skiing, where x is time in minutes and why is the number of calories. the graph shows the calories he burns while playing basketball which activity burns at a faster rate? explain