Answer:
50 mL
Step-by-step explanation:
The quantity of juice in the juice box = 500 mL
The juice box label says contains 10% real fruit juice.
Quantity of real fruit juice are in eduardo's juice box will be :
[tex]A=10\%\ of\ 500\\\\=\dfrac{10}{100}\times500\\\\=50\ mL[/tex]
So, 50 mL of real fruit juice is in eduardo's juice box.