Question

A rectangular tank is 4m long, 3m wide and 1.5 m high and is filled with water up to 0.6m.
How many stones of 15cmx10cmx8cm are to be dropped to take the water to the top of the tank?
A)9000
B)10,000
C)1000
D)900

Answer 1

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Answer 2

4 metre is equal to 400 CM
3 metre is equal to 300 CM
1.5 m is equal to 150 cm
now volume of the rectangular tank is =

length into breadth into height
equal to 400 into 300 into 150 =18000000 cm^3

the height of the water level is 0.6 M
=60centimetre
now volume of the water level =400×300×60 cm^3
=7200000 cm^3
so volume of the tank where is not water
=18000000-7200000 cm^3
=10800000 cm^3
now volume of the stone =15 into 10 into 8 cm^3
=1200 cm^3
now number of the stone drop to take the water to the top of the tank
=10800000÷1200
=9000
this is your answer .hope it will be helpful to you .please mark as brain list answer