a cistern 10 m long and 8 m wide contains water up to a depth of 1 m 50 cm . the total area of the wet surface is :
"area of the wet surface = [ 2 ( lb + bh + lh ) - lb ] = 2 ( bh + lh ) + lb = [ 2 ( 8 x 1.50 + 10 x 1.50 ) + 8 x 10 ] m 2 = 134 m 2 . answer : e"
add(multiply(const_2, add(multiply(add(divide(50, const_100), 1), 8), multiply(add(divide(50, const_100), 1), 10))), multiply(8, 10))