a cistern 6 m long and 5 m wide contains water up to a depth of 1 m 25 cm . the total area of the wet surface is :
"area of the wet surface = [ 2 ( lb + bh + lh ) - lb ] = 2 ( bh + lh ) + lb = [ 2 ( 5 x 1.25 + 6 x 1.25 ) + 6 x 5 ] m 2 = 57.5 m 2 . answer : option e"
add(multiply(const_2, add(multiply(add(divide(25, const_100), 1), 5), multiply(add(divide(25, const_100), 1), 6))), multiply(5, 6))