My brother is 5 years older then me. my sister is 3 years younger than me. three years ago how much younger was my sister?

For this case we have to find out how much younger sister I was three years ago.

Let the variable "x" be my age. So:

If my brother is 5 years older then:

If my sister is 3 years younger then:

For any value of "x", that is, my age, my brother will always be 5 years older and my sister 3 years younger. Then, three years ago when I was x years old, my sister was three years younger than me.

she was three years younger than me

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