a cistern of capacity 8000 litres measures externally 3.3 m by 2.6 m by 1.2 m and its walls are 5 cm thick . the thickness of the bottom is :
"explanation : let the thickness of the bottom be x cm . then , [ ( 330 - 10 ) × ( 260 - 10 ) × ( 120 - x ) ] = 8000 × 1000 = > 320 × 250 × ( 120 - x ) = 8000 × 1000 = > ( 120 - x ) = 8000 × 1000 / 320 = 100 = > x = 20 cm = 2 dm . answer : b"
subtract(multiply(multiply(3.3, 2.6), 1.2), divide(8000, const_1000))