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OpenStudy (anonymous):
Of 100 clock radios with digital tuners and / or CD players sold recently in a department store, 70 had digital; tuners and 90 and CD players. How many radios had both digital tuners and CD players?
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OpenStudy (anonymous):
The answer is 60. 100 = 70 + 90 - DTandCD
OpenStudy (anonymous):
I do not get how that come to 60
OpenStudy (anonymous):
I wrote the formula that shows how I got it. What don't you get about it?
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