A sweet sister cares for her little brother

Algebra Level 3

One night, Alfred and Brenda won a sum of prize money after playing as a pair in a game show. Out of respect for his big sister who has taken good care of him over the years, Alfred split the money such that Brenda had the bulk.

However, Brenda was sad that her little brother, Alfred, did not have enough money. Being the generous girl that she is, she suggested giving Alfred $90 such that Alfred had thrice the amount of money as Brenda.

Touched by his big sister's sweetness, Alfred expressed that he was adamant about letting Brenda have the bulk. He suggested Brenda giving him just $20 such that she had twice the amount of money as him.

How much money did Brenda take at first?


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