Math
posted by Rich .
Can you help me with my son's homework question:
Maria earned $110, which is $86 more than twice the amount Joan earned. How much did Joan earn?
a. $12
b. $18
c. $24
d. $30
I would like to know the 5th grade equation that represents the answer. I guess I'm not smarter than a 5th grader on this one. Thanks for your help.

well, TwiceJoaneared + 86 is 110
so twiceJoanearned must be 24 so joan earned.... 
Seems Like Joan earned $12.
Thanks! 
11086=24

as of july 2004, the population of the united states was 293,027,571.If more than half of these people live within 80 kilometers of an ocean, about how many people live within that distance?
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