The ratio of sodium chloride to ammonium in 100 kg of mixed ammonium normally used by three chemists is 7: 25. The amount of sodium chloride to be added to 100 kg of mixed ammonium to make the ratio 9 :25 is Answers
A) 5 kg  B) 6.625 kg  C) 6.25 kg  D) 6.35 kg  E) 6.55 kg
sodium chloride in 100 kg = 7/32 x 100 = 21.875 kg   ammonium in 100 kg = 25/32 x 100 = 78.125 kg   Now 78.125 is 25 parts out of   (25 + 9)= 
<gadget id="calculator">  (25 + 9)</gadget>
<output>34</output>
34 parts.   Hence 9 parts= 9/25 x 78.125 = 28.125   Amount to be added = 28.125 - 21.87 5= 6.25 Kg   ANSWER:6.25 kg
<result>C</result>
The ratio of sodium chloride to ammonium in 100 kg of mixed ammonium normally used by three chemists is 7: 25. The amount of sodium chloride to be added to 100 kg of mixed ammonium to make the ratio 9 :25 is