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Shawna has 50, 48,46,44 or 42 yellow pencils.

Step-by-step explanation:

Here, given the total number of pencils Shawna has  = 55 pencils

So, The number of YELLOW PENCIL + BLUE PENCIL = 55

or, Y  + B = 55

Now let us take the given cases of blue pencils one by one:

1. If she has 5 blue pencils

Here, B = 5

So, as Y  + B = 55 ⇒    Y +  5  = 55

or, Y = 5 5 - 5  = 50

Hence, Shawna has 50 yellow pencils.

2. If she has 7 blue pencils

Here, B = 7

So, as Y  + B = 55 ⇒    Y +  7  = 55

or, Y = 5 5 - 7  = 48

Hence, Shawna has 48 yellow pencils.

3. If she has 9 blue pencils

Here, B = 9

So, as Y  + B = 55 ⇒    Y +  9  = 55   ⇒  Y  = 55- 9 = 46

Hence, Shawna has 46 yellow pencils.

4. If she has 11 blue pencils

Here, B = 11

So, as Y  + B = 55 ⇒    Y +  11  = 55   ⇒  Y  = 55- 11 = 44

Hence, Shawna has 44 yellow pencils.

5. If she has 13 blue pencils

Here, B = 13

So, as Y  + B = 55 ⇒    Y +  13  = 55   ⇒  Y  = 55- 13 = 42

Hence, Shawna has 42 yellow pencils.