Question 129576
Let a=Josh's brother's age; a+1=Josh's brother's age one year from now
Then a+10=Josh's age; (a+10)+1=Josh's age one year from now

Now we are told the following:

(a+10)+1=3(a+1)  dimplify

a+11=3a+3  subtract a and also 3 from both sides

a-a+11-3=3a-a+3-3  collect like terms

8=2a  divide both sides by 2

a=4------------------------------Josh's brother's current age

a+10=4+10=14---------------------------Josh's current age.

Now, by inspection, we see that when Josh's brother was 4-4=0 years old, Josh was 14-4=10 years old

CK

4+10=14
14=14

14+1=3*(4+1)
15=15


Hope this helps---ptaylor