Arthur had $90. He spent $40 and gave $20 to his brother. What fraction of Arthur's money is left

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Arthur had $90. He spent $40 and gave $20 to his brother. What fraction of Arthur's money is left?

Arthur starts with $90.
He gives away $40, so now he has $90 - $40 = $50.
Next, he gives $20 to his brother, so now he has $50 - $20 = $30.

So Arthur has 30/90 left.

We type 30/90 into our search engine and simplify to get:
1/3