a cistern of capacity 8000 litres measures externally 3.3 m by 2.6 m by 1.4 m and its walls are 5 cm thick. the thickness of the bottom is:
Choose one
A) 90 cm
B) 4 dm
C) 1 m
D) 1.1 cm
E) none of these
<gadget id="calculator">3.3 * 2.6</gadget>
<output>8.58</output>

<gadget id="calculator">8.58 * 1.4</gadget>
<output>12.012</output>

<gadget id="calculator">8_000 / 1_000</gadget>
<output>8</output>

<gadget id="calculator">12.012 - 8</gadget>
<output>4.012</output>

<result>B</result>
a cistern of capacity 8000 litres measures externally 3.3 m by 2.6 m by 1.4 m and its walls are 5 cm thick. the thickness of the bottom is:
subtract(multiply(multiply(3.3, 2.6), 1.4), divide(8000, const_1000))
"explanation : let the thickness of the bottom be x cm . then , [ ( 330 - 10 ) × ( 260 - 10 ) × ( 140 - x ) ] = 8000 × 1000 = > 320 × 250 × ( 140 - x ) = 8000 × 1000 = > ( 140 - x ) = 8000 × 1000 / 320 = 100 = > x = 40 cm = 4 dm . answer : b"