When I was two years old my brother was half of my age if I am 100years old, how old is my brother

x=99 years old

Step-by-step explanation:

Let x=your brother's age

Now the problem tells us that 98 years ago, your were 2 years old and your brother was (1/2)*2=1 year old  

So our equation to solve is:

x-98=1 add 98 to each side

x=99 years oldyour brother's age

99 years old.

Step-by-step explanation:

When you were two, your brother was half your age, that is one year old. So when you're 100 years old, your brother will be 1 year less than you. Therefore he will be 99 years old.

-2 is the right