Divide 28 cans of soda into two groups so the ratio is 3 to 4to

Just tell me how to set up the equation.

This is a map of the mars exploration rover opportunity predicted landing site on mars. the scale is 1cm : 9.4km. what are the approximate measures of the actual length and width of the ellipse? i mostly need to know how to set it up : )

There were 25 students who answered to a survey about sports. four-fifths of them like football. how many students like football?