Hello dear aspirant,

The b.arch paper consists of 25 questions from mathematics and each right answer is awarded with four marks.Hence the total weightage of mathematics in the paper is 100.
Hope this would be helpful to you.

Dear aspirant,
If you are giving the B architecture paper of jee mains. Here is the paper score pattern
Subjects.      Maximum questions.        Maximum marks
Mathematics.     25.                                      100
Aptitude test.      50.                                      200
Drawing.      02.                                           100
So you can now see the 25% is the weightage of mathematics in B arch. Paper .

Thank you

the mathematics weightage in b-arch is 25 questions. each question carries 4 marks each. the weightage is 25x4=100 marks