please solve this

Asked by Latha | 6th Nov, 2017, 01:38: PM

Expert Answer:

begin mathsize 16px style Let space the space straight y space litre space of space 75 percent sign space you space need space to space add space to space the space tank space to space get space 30 percent sign space brine space solution.
Total space mixture space equals space left parenthesis 50 plus straight y right parenthesis space litre
50 cross times 25 percent sign plus straight y cross times 75 percent sign equals left parenthesis 50 plus straight y right parenthesis cross times 30 percent sign
50 cross times 25 over 100 plus straight y cross times 75 over 100 equals left parenthesis 50 plus straight y right parenthesis cross times 30 over 100
1250 plus 75 straight y equals 1500 plus 30 straight y
75 straight y minus 30 straight y equals 1500 minus 1250
45 straight y equals 250
straight y equals 250 over 45
straight y equals 50 over 9
50 over 9 space litres space of space 75 percent sign space you space need space to space add space to space the space tank space to space get space 30 percent sign space brine space solution.
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Answered by Sneha shidid | 20th Dec, 2017, 11:26: AM