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Giselle works as a carpenter and as a blacksmith.$\newline$She earns $\$ 20$ per hour as a carpenter and $\$ 25$ per hour as a blacksmith. Last week, Giselle worked both jobs for a total of $30$ hours, and earned a total of $\$ 690$.$\newline$How long did Giselle work as a carpenter last week, and how long did she work as a blacksmith?$\newline$Giselle worked as a carpenter for $\square$ hours and as a blacksmith for hours last week.