Question

In a chalk-box, the ratio of the number of blue chalk pieces to the number of red chalk pieces to the all chalk pieces is 2 : 1 : 8.

What fraction of the chalk pieces in the box are neither blue nor red?
(Write your answer as a fraction in the lowest form.)

Answer 1

$\Huge\dfrac{5}{8}$

$\Large\text{\underline{\underline{Explanation}}}$

The amount of red chalk takes $\dfrac{1}{8}$ of the total.

The amount of blue chalk takes $\dfrac{2}{8}$ of the total.

Both of them take $\dfrac{3}{8}$ of the total, and we expect the total fraction as 1. The fraction of the chalk, which is neither red nor blue, is $\dfrac{5}{8}$.