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This is a straightforward question.

Calculate the volume of water in the tank. 

Subtract the volume that has flowed out from Tap Y.

Add the volume of water that has flowed in from Tap X. 

Divide by the base area of the tank.

That is the height of the water. 

Make sure you convert litres to cubic centimetres.

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aftr added volume of water flowed through X it came 117000

and base ares is 1500 

answer 117000 divide by 1500??

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Volume = 50 x 30 x 70 – 40 x 1200 + 30 x 800

Height of water = Volume / Base area

Answer should be 54 cm. 

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40*1200 for 1st 10 mins and after 30 min water flow out by Y right?

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40*1200 for 1st 10 mins and after 30 min water flow out by Y right?

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Read the question carefully  

1st 10 minutes: Tap Y is on. 

Next 30 minutes: Tap X and Tap Y are on.

Altogether, Tap Y is draining for 40 minutes, Tap X is filling the tank for 30 minutes. 

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