MARKING BRAINIEST!! Casey has a total of 18 pens. Twelve of these pens are blue, and the rest are red. What is the ratio of blue pens to red pens?
A 1:2
B 2:1
C 2:3
D 3:2

B)  2:1

Step-by-step explanation:

For every 12 blue pens, she has 6 red pens 12:6

Simplify 12:6= 2:1

B. 2:1

Step-by-step explanation:

Total # of pens = 18

# of Blue pens = 12

The number of red pens

= Total # of pens - # of blue pens

= 18 - 12

= 6 red pens

Ratio = 12 : 6

Simplified = 2:1

step-by-step explanation:

if you want to solve percent error follow these steps.

1. subtract the accepted value from the experimental value.

2. take the absolute value of step 1.

3. divide that answer by the accepted value.

4. multiply that answer by 100 and add the % symbol to express the answer as a percentage.

if you want to solve percent of change just do this.

1. work out the difference (increase) between the two numbers you are comparing.

2. divide the increase by the original number and multiply the answer by 100. if your answer is a negative number then this is a percentage decrease.

hope this : )