No.
If you add them up you DO NOT GET 
According to mathematics, it equals to 
.
Answer:
Step-by-step explanation:
For the volume of triangular prism, volume = 0.5xaxbxc
=0.5x10x7x6
=210cm^3
Answer:
son's present age = 30
father's present age=60
Step-by-step explanation:
his son's present age = x years
his father's present age = 2x years
before 20 years his son's age=(x-20) years
before 20 years father's age=(2x-20) years4(x-20)=(2x-20)
4x-80=2x-20
4x-2x=80-20
2x=60
x=30
