Cbse Class 11 Linear Inequalities Miscellaneous Exercise on Chapter 5 Q 11 and 12 in Tamil / New Syllabus / Navimaths 11. A solution is to be kept between 68° F and 77° F. What is the range in temperature in degree Celsius (C) if the Celsius / Fahrenheit (F) conversion formula is given by F = 9 C/5 + 32 ? 12. A solution of 8% boric acid is to be diluted by adding a 2% boric acid solution to it. The resulting mixture is to be more than 4% but less than 6% boric acid. If we have 640 litres of the 8% solution, how many litres of the 2% solution will have to be added? #navimaths #mathematics #linearinequalities #class11maths #cbse #ncert