a box contains 15 yellow marbles

Answer:
[tex]\frac{15}{70} =\frac{3}{14}[/tex]
Step-by-step explanation:
As there are 15 yellow marbles, 30 green marbles, and 25 red marbles there are a total of 70 marbles.
As there are 15 yellow marbles, the probability can be written as
[tex]\frac{15}{70} =\frac{3}{14}[/tex]