In a box of pencils , 1/8 of the pencils are blue and 5/8 of the pencils are green . The rest of the pencils are red . What fraction of the box of pencils is red ?

1/4

Step-by-step explanation:

the total amount of pencils in the box are

number of pencils that are blue are

number of pencils that are green are

number of pencils that are red is (x)

therefore an equation can be formed:

total number of pencils =  blue pencils + red pencils + green pencils

8/8  = 1/8  +  x  + 5/8

make x the subject of formula

x = 8/8  - 5/8  - 1/8

x = 2/8

simplified becomes x = 1/4

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5/6

step-by-step explanation:

if i remember correctly with perpendicular stuff you just take away the negative