Correct Answer: Option B

Explanation

\(mean=\frac{60+5x}{18+x}\\3.5=\frac{60+5x}{18+x}\\\frac{7}{2}=\frac{60+5x}{18+x}\)
7(18+x) = 2(60+5x)
126 + 7x = 120 + 10x
10x - 7x = 126 - 120
3x = 6
x = 2

• a truck of mass 20kg moving at a speed of 8m/s, collides with another truck of mass 30kg moving in... Answer this

  0 Answers   ·   25 minutes ago
• Passing a thread in and out of a fabric in order to make specific design? Answer this

  1 Answers   ·   11 hours ago
• the leader and the lesson by niyi osun dare is about leadership in Africa.discuss? Answer this

  1 Answers   ·   Literature in English   ·   12 hours ago