A tank measuring 80 cm by 60 cm by 55 cm was 1/5 filled with water. A tap was turned on to fill it up with water at a rate of 9 litres per min. Every 30 seconds after the tap was turned on, an iron ball with a volume 500 cm3 was dropped into the tank. How many iron balls would there be in the tank when the water level reached the brim? (Ans 42 iron balls)
4/5 x 80 x 60 x 55 = 211200 cm3
60 s --> 9000 cm3
30 s --> 30/60 x 9000 = 4500 cm3
1 set --> 4500 + 500 = 5000 cm3
211200 / 5000 = 42 sets (max) --> 42 iron balls
There were 42 iron balls.
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