It depends on the history of colonialism in the area, but a safe bet is Swahili / French and English.
Explanation:
Near the Cote d'Ivoire and Senegal regions the <u>French</u> had influence for many years, so naturally many Africans there speak French.
<u>English</u> is the current language of business and higher education --everyone wants to know English because it's helpful in trade and commerce.
<u>Swahili</u> is a "lingua franca" in East Africa, which means that it's often used as an intermediate for two people who have their own native tongue (say, Yoruba and Igbo).
