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60 po yan.. I think.

5%(n) + 1/4(n) + 1/2(n) + 12 = n

where n = total number of marbles

simplifying:

4/5(n) + 12 = n
4/5(n) - n = -12
- 1/5(n) = -12

n = 60
 
60 is the answer since may clue ka ng 12 white marbles which is 20% of the total number of marbles in the jar then ginawa ko na lang is (12*2)+(12*2) = 30 which is now the 50% of the total number of marbles then multiply mo lang ulit by 2 then 60 ang answer

p.s. not really sure about this xd bob0 ako sa math :3
 
1/4 plus 1/2 =3/4 equivalent to 75%
Black marble is 5% total is 80% so white marble is 20%..just divide 12 by 20%
 
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