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One-fourth of all telephones at the office have built-in speaker phones. One- half the phones with the built-in speaker phones have conference-call capability. How many

One-fourth of all telephones at the office have built-in speaker phones. One- half the phones with the built-in speaker phones have conference-call capability. How many of the phones in the office have both a speaker phone and conference-call capability? A 1/2 B 1/4 C 1/6 D 1/8

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