<human>:  Angie is part of a household with shared expenses and contributes $42 a month for necessities. She has a salary of $80 per month. She also pays a share of the household taxes each month. At the end of this month, she had $18 left over. How much did she pay in taxes this month?
<bot>: How much did Angie earn? ** Angie earned 80 and paid 42 for necessities, so she had 80 - 42 = $<<80-42=38>>38 left.
How much did Angie pay in taxes? ** Angie had 18 left after paying taxes, so her share of the taxes was 38- 18 = $20 this month.
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