Jose is 8 years older than his sister. the sum of their ages is 20. how old is jose?
yrs. old

He is 20 years old.

Step-by-step explanation:

cuz 20 - 8 = 12(sisters age)

so if the sum of both their ages is 20 then, he is 20.

Given density and volume, the mass (m) of the substance is the product of the density (d) and volume (v). 
                                     m = d x v
Substituting the known values,
                             m = (0.1685 kg/m³) x (2,850 m³) 
The answer is approximately 480.225 kg.