Respuesta :
4 blue marbles. 5 white marbles. 5/15=3. 3x4=12. i think it’s 12 marbles.
Answer:
There are 12 marbles
Step-by-step explanation:
blue : white
4 : 5
White = 15
x : 15
So,
4/5 = x/15
Cross multiply,
4 × 15 = 5 · x
60 = 5x
60 / 5 = x
12 = x
4 : 5 = 12 : 15