The ratio of boys to girls in a class is 3:4. If there are 21 students in the class, how many of them are girls?

9 boys 12 girls

Step-by-step explanation:

3:4

6:8

9:12

it will cost dollar $540

the living room is 3 which means if we divide 325/3 then we get $108

therefore if 1part of the living room cost $108 and 3 costed $325

then total 5part of the room will cost 5*108 which gives $540