1/3b - 3 = 3
what is b

b=18

Step-by-step explanation:

1/3b -3=3

1/3b-3+3=3+3

1/3b= 6

isolate b

1/3 *3 b= 6 *3

b=18

ruth is 6 years old

step-by-step explanation:

6 + 24 = 30,   so 6/30 = .2  

if you do 1/5 it also equals .2, so that is the answer.

answer: 8 years

step-by-step explanation:

the explanation is that in 8 years the child will be 20 and in 8 years the father will be 40 and 20 is half of 40.