Respuesta :
Answer:
blue=1/10
Step-by-step explanation:
so there are 3 types of pens
Red = 4/10
black= 5/10
blue=?
so u add up the other 2 fractions - 4/10+5/10 to get 9/10
then u see how many Corbin would have left: 1/10
1/10= that the amount of blue pens he has.