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Answer:
$55
Step-by-step explanation:
John earns two times more than Adam, plus $15 more.
2x + 15
Together, Adam and John earned $180, so we can set up an equation:
x + 2x + 15 = 180
3x + 15 = 180
3x = 165
x = 55
So, Adam earned $55 on Saturday.