koala vishnukavili The stem is convoluted hence we find it hard.
Let's say mixture \(A = 60kg\) & \(B = 100kg\)
Cement is \(15\)% by weight in mixture \(A\) so cement \(= 9kg\)
Read the big words:
One-fourth of the weight of mixture A was then
taken from mixture B, which was 40% cement by weight
and added to mixture A.So, \(15kg\) (\(\frac{1}{4}\)th of \(A\)) is taken from mixture \(B\). So \(15kg\) of mixture \(B\) will have \(6kg\) cement.
Total weight of \(A = 60 + 15 = 75kg\)
in A, the weight of cement \(= 9 + 6 = 15kg\)
New %age = \(\frac{15}{75}*100\)% \(= 20\)%
%age increase \(= 5\)%
Answer
D