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Mathematics: Post your doubts here!

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Note: There may be different methods to do this question.
Imagine that the circular pool is a cylinder.
In this question it is asked we should write in 'cm'.
So lets change the other units in to cm.
12Litres = 12000cm^3 (volumes are always in cubic units)
5millimetres=0.5cm
When 12000cm^3 of water(volume) is emptied to the pool, the water level rises by 0.5cm(height).
Formula for finding volume of a cylinder is
π x r^2 x h = Volume
We know the values of 'h' and 'V'. radius is what we need.
π x r^2 x 0.5 = 12000
r^2 = 12000/(π x 0.5)
r = square root of [12000/(π x 0.5)]
= 87.40387
=87 cm (correct to nearest cm)
Remember you should write the answer correct nearest 'cm' or you may lose marks. Because it is given in the question.
If you have any doubts you can ask me or you can ask ***amd***.
Thanks, I understood how to do it :)
It seems easy to do but the only problem I may face is conversions.
My igcse math is on 5th nov (paper2) and 8th nov (paper 4).
 
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Math Question Simple it is ?
Prashant of height 1.2m is going away from the lamp post at speed of 1.5m/s.
If the lamp post is 3.9 m above the ground then the length of his shadow after 3 seconds is ??????
 
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Math Question Simple it is ?
Prashant of height 1.2m is going away from the lamp post at speed of 1.5m/s.
If the lamp post is 3.9 m above the ground then the length of his shadow after 3 seconds is ??????

idk .. :p
 
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Math Question Simple it is ?
Prashant of height 1.2m is going away from the lamp post at speed of 1.5m/s.
If the lamp post is 3.9 m above the ground then the length of his shadow after 3 seconds is ??????

Light comes from top of lamp in theory so ...
 

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Hi suri003, if you have any doubt in maths, you can ask here.
And maths isn't a difficult subject.
Can someone help me with this easy yet confusing questn?

A man spends 1/3 of his salary on housing and 2/5 of the remaining on food. What fraction is left for other purposes?
 
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