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Let x be the number of weeks.

Malou's money: 500 + 50x
Arthur's money: 700 + 40x

500 + 50x = 700 + 40x  \\  \\ 50x-40x=700-500 \\  \\ 10x=200 \\  \\ x=20

They will have the same amount of money (P1,500) in 20 weeks.
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