a cistern 12 m long and 14 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 ( 14 x 1.25 + 12 x 1.25 ) + 12 x 14 ] m 2 = 233 m 2 . answer : e"
add(multiply(const_2, add(multiply(add(divide(25, const_100), 1), 14), multiply(add(divide(25, const_100), 1), 12))), multiply(14, 12))