divyajoshi12 wrote:
In an experiment, a solution ‘P’ was observed. 1st hour ,8% of solution ‘P’ evaporated. In 2nd hour, 5% of remaining solution evaporated. What percent of initial solution is left after 2 hours?
Ans-
A-80
B-85.4
C-67
D-87.4%
Can someone please help me explain the question when it talks about the “5% of remaining solution evaporated”.
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step-1
1st hour we subtract 8% from p
we are left with p-0.08p=.92p = 92% of the solution
step 2
5% of the remaining means 5% of 92% soluton
which is 4.6%
remaining 92-4.6 = 87.4%