In a school gym, the ratio of the number of boys to the number of girls was 4:3. After 160 boys left, the ratio became 4:5, How many girls were in the gym?

Ifound this on google “that means that the graph of a function with direct variation has these features: it is a straight line: because the slope is the ratio y/x = k. it passes through the origin (0,0): because y = kx = k (0) = 0.” i hope this you for what your looking for