self Maths Puzzle Logical Reasoning Number Series

12,6.5,7.5,12.75,27.5,71.25,?
what will be the next no???????

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self Other Question

if a,b,c,d,p and q are non zero , unequal integer and (a+bi)/(c+di), then a^2+b^2/c^2+d^2 equal pure milk contains 89% of water.How much water has been added to pure milk to form a sample of 22 litre milk containing 90% water.