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3.we are required to fill it upto to 50%.
So, 50% of the total capacity of the tank is=> 50*50/100 = 25 litres.
therefore, amount of water to be put in the tank to get filled its desired amount is 25-15 = 10 liters
4.Let the initial length and width of rectangle is l and b respectively.
The area of rectangle is l*b.
The length is increased by 50 % which means that the the length becomes 150% of original length {say 1.5 times the original length}.
The area should be l`*b`
Where l` is equal to 1.5 l
The two area should be equal then
l`*b`= l*b
1.5l* b`= l*b
b`= (l*b) /1.5l
= 2/3 b
Hence the width should be decreased to 2/3b.
The % decrease in width should be (1-2/3)*100 or 33.33%
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