The total surface area of the walls of a room 7m long, 5m wide and...
MATHEMATICS
WAEC 2005
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. 2/3
- B. 2
- C. 4
- D. 8
Correct Answer: B. 2
Explanation
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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