The total surface area of the walls of a room 7m long, 5m wide and xm high is 96m2. Find the value of x

  • A \(\frac{2}{3}\)
  • B 2
  • C 4
  • D 8
waec 2005mathematics

The correct answer is B. 2

T.S.A of the wall \(=2(7\times 5 + 7 \times x + 5 \times x) = 96\\

70 + 14x + 10x = 96 \Rightarrow 24x = 96-70=26\\

x = \frac{26}{24}=\frac{13}{12}\)

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