Question

A Box 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

Answer 1

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.