A 6 m long by 4 m broad cistern holds water to a depth of 1 m 25 cm. The wet surface's entire area is:
A. 49 m2
B. 50 m2
C. 53.5 m2
D. 55 m2
Answer:A
A 6 m long by 4 m broad cistern holds water to a depth of 1 m 25 cm. The wet surface's entire area is:
A. 49 m2 B. 50 m2 C. 53.5 m2 D. 55 m2
Explanation: [2(lb + bh + lh) - lb] = 2(bh + lh) + lb = [2 (4 x 1.25 + 6 x 1.25) + 6 x 4] m2 = 49 m2.