If p : q = 2 3 : 3 and p : r = 3 4 : 2 3 , calculate the ratio p : q : r

[10 points, algebra 2-simplifying complex fractions]according to my answer key the restrictions are -1 and 4. but why not positive 1?

X+y=-4 x-y=2 use elimination with adding and subtraction

Mikes car gets an average of 28 mpg. there are 12 gallons of fuel in mikes car when he starts his trip of 140 miles. about how many gallons are left at the end of his trip?