Answer:
[tex]\huge\boxed{\sf 30\ marbles}[/tex]
Step-by-step explanation:
Total marbles = 48
Ratio of red marbles to black marbles = 5 : 3
Total ratio = 5+3 = 8
Red Marbles:
= [tex]\sf \frac{5}{8} * 48[/tex]
= 5 * 6
= 30 marbles
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!