Answer:
Ratio = 1 : 4
Step-by-step explanation:
Total marbles = 10
Given 1/5 is red, that is 1/5 of the total marbles are red
[tex]\frac{1}{5} \ of \ 10 = \frac{1}{5} \times 10 = 2[/tex]
Therefore , 10 - 2 = 8 marbles are blue.
Ratio of red marbles to blue marbles
[tex]\frac{2}{8} = \frac{1}{4} = 1 : 4[/tex]
