Abox have 108 colored pencils 1/3 are blue 3/12 are green 1/10 are red and the rest are yellow what is the fraction and how many yellow pencils are there

Make sure all the denominators are equal, and then add the numerators.
Blue: 1/3 = 20/60
Green: 3/12 = 15/60
Red: 1/10 = 6/60
20/60 + 15/60 + 6/60 = 41/60
Subtract this from the whole fraction.
60/60 - 41/60 = 19/60
Divide 108 by 60.
60/108 = 1.8
Multiply 1.8 by the numerator, 19.
1.8 * 19 = 34.2
Round it down to get 34 yellow pencils.

That would be plagiarism