21. On Saturday, Dora installed 5 windows per hour for 6 hours. On Sunday, Dora installed 13 windows. How many more windows did Dora install on Saturday than on Sunday?
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On Saturday, Dora was a window-installing superstar, cranking out a whopping 5 windows per hour for 6 hours! That adds up to a total of 30 windows installed on Saturday (5 windows/hour * 6 hours = 30 windows). Now, on Sunday, she installed 13 windows. To find out how many more windows she installed on Saturday than Sunday, we simply subtract: 30 windows (Saturday) - 13 windows (Sunday) = 17 windows. So, Dora installed 17 more windows on Saturday than she did on Sunday!