6th grade math
posted by marisol .
if Mary buys oranges at 5 for 2 cents and sell them at 4 for 3 cents how many must she buy and sell to make a profit of 420 cents?

profit= revenuecosts
profit=420cents=3cents/4 *N  2cents/5 *N
N= 420/(3/42/5)
N=20*420/(20(3/42/5))=20*420/(158)
= 20*420/7= you do it.
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