At the banquet, the ratio of the number of girls is 5 : 3. halfway through the banquet, 20 boys leave and the ratio becomes 5: 4. how many girls are at the banquet?

let y equal to

the total fare and x is the mile of taxi ride. so the equation is

y = 0.55x + 1.75

since susie has

$10 to spend for a taxi cab, so he can have

10 = 0.55x +

1.75

x = 15 miles of

taxi ride

so the system of

inequality is

10 < 0.55x +

1.75

x > 2