Question

Tommy is twice as old as his younger sister.The sum of the siblings' ages is 21. Which equation can be used to determine the age of Tommy's younger sister?

Answer 1

I think its 14 because there is few siblings . 21 divided by those few is 7 , and you double 7 it makes 14. So, I believe the answer is 14. Good luck ! 

Answer 2

Get all the ages back to gather than list the least to greatest one your done with that fine he least and multiply it by 2