The ratio of the number of boys to the number of girls at a school is 4.5. if there are 120 boys how many students are there altogether

120 boys with a 4:5 ratio, first divide 120 by 4 leaving you with 30, since theres just 1 more girl for every boy, theres 1 more 30 you add, leaving you with 150.

Take your 2 numbers and combine (120+150) leaving you with your answer

270 students total.

distance covered by pamela in 9 l of fuel = 99km

let us apply unitary method here.

distance covered by pamela in 1 l of fuel =99/9 =11 km

now let us find distance covered by pamela if she has 12 l of fuel.

distance covered in 12 l = distance covered in 1 l of fuel * 12

we know that distance covered by here in 1 l is 11 km.

so distance covered in 12 l of fuel = 11*12 = 132 km.