The ratio of sodium chloride to ammonium in 100 kg of mixed ammonium normally used by three chemists is 3: 13. The amount of sodium chloride to be added to 100 kg of mixed ammonium to make the ratio 9 :25 is  Choose the most appropriate option
A) 10.5 kg B) 6.625 kg C) 6.25 kg D) 6.35 kg E) 6.55 kg
sodium chloride in 100 kg = 3/16 x 100 = 18.75 kg   ammonium in 100 kg = 13/16 x 100 = 81.25 kg   Now 81.25 is 25 parts out of   (25 + 9)= 
<gadget id="calculator">  (25 + 9)</gadget>
<output>34</output>
34 parts.   Hence 9 parts= 9/25 x 81.25 = 29.25   10.5 kgmount to be added = 29.25 - 18.75= 
<gadget id="calculator">29.25 - 18.75</gadget>
<output>10.5</output>
10.5 Kg   10.5 kgNSWER:10.5 kg
<result>A</result>
The ratio of sodium chloride to ammonium in 100 kg of mixed ammonium normally used by three chemists is 3: 13. The amount of sodium chloride to be added to 100 kg of mixed ammonium to make the ratio 9 :25 is