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Mathematics, 11.07.2019 09:30 Ibnushuaibabutalhah

One fourth of all telephones at the office have built-in speaker phones. 1/2 of the phones with built-in speaker phones have conference call capability. how many phones in the office have both speakernphone and conference call capability?

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One fourth of all telephones at the office have built-in speaker phones. 1/2 of the phones with buil...
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