13 students are wearing purple uniform in a class of 21 students. Write the ratio of students wearing purple uniform to student NOT wearing purple uniform in the class.

There are 16 students total.

1/4 (4 students)--> Yellow Costumes

6 students--> Purple Costumes

(?) students--> Orange Costumes.

We know that one fourth of the students is 4 students by doing simple division.

6 students are wearing purple costumes.  

Add these together.

4+6 = 10

The remaining students are wearing orange costumes.

There are 6 students remaining.

Therefore, 6 students are wearing orange costumes.

6 Students

Step-by-step explanation:

the two may have that, even a breakdown is probably offered

step-by-step explanation:

given perimeter: 28cm

length: 9cm

atp,

2(l+w)=p of the reactangle

2(9+x)=28

18+2x=28

2x=28-18

x=10/2

x=5

therefore width is 5 cm