The ratio os pens to pencils in darnell's case is 3: 5 . he has 15 pens. how many pencils does darnell have?

Lets say 3x is the # of pens Darnell has.

So 3x=15

and x =5

Now put it into the ratio

3:5 = 3x:5x

So he has 25 pencils.

add an image !

step-by-step explanation:

5x+40

5(x + 8)

7x - 49

7(x - 7)

18x + 9

9(2x + 1)

15x - 10

5(3x - 2)

step-by-step explanation:

for number one all you have to do is factor 5 out of 5x + 40

for number 2 factor 7 out of 7x - 49

for number three factor 9 out of 18x + 9

for number four factor 5 out of 15x - 10