00:01
Dear students, we have 1 % hydro -coctician ointment 250 gram.
00:05
Now, how much extra hydro -cotition should be added so that it will become 5%.
00:13
Now, as for the question, since it is 1 %, let us see first how much of hydro -coctician powder is present in this alignment.
00:22
Let it be x.
00:23
So x multiplied by 100 divided by 250 is equal to 1%.
00:29
Implies x equal to 250 by 100 equal to 2 .5 gram.
00:35
So 2 .5 gram is already present.
00:40
Now let us add, we need to add, let we need to add y gram to make it 5%.
00:57
Therefore, when you add y gram, earlier it contains already 2 .5%, so, amount of hydro -coctition powder is now 2 .5 plus y multiplied by 100 divided by the amount is 250, which is equal to how much 5%...