Answer:
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.
-t = -8 ×5
-t = -40
t= 40
good luck have a nice day
32 miles/4 hours.
communitive property
You just read it
