Question

Could you answer the question number b​

Answer 1

Grade A 2:9

Grade B 1:3

Grade C 4:15

Explanation:

Students in grade A:

`450-(120+80)=450-200=250`

if the ratio is 2:3 then

`A=(250/5)(2)=(50)(2)=100` students

The ratio of students with grade A:

`(100)/(450)=(10)/(45) =(2)/(9)`

=
`2:9`

Students with grade B.

`B=250-100=150`

The ratio of B:

`(150)/(450) =(15)/(45) =(1)/(3)`

`= 1:3`

Ratio of students with grade C:

`=(120)/(450) =(12)/(45) =(4)/(15)`

`=4:15`

Hope this helps

Answer 2

450 - 120 - 80

=250

2/5 × 250 = 100. A

3/5 × 250 = 120 B