The ratio of sodium chloride to ammonium in 100 kg of mixed ammonium normally used by three chemists is 2: 15. The amount of sodium chloride to be added to 100 kg of mixed ammonium to make the ratio 9 :25 is Pick:
A) 20 kg
B) 6.625 kg
C) 6.25 kg
D) 6.35 kg
E) 6.55 kg
sodium chloride in 100 kg = 2/17 x 100 = 11.76 kg   ammonium in 100 kg = 15/17 x 100 = 88.23 kg   Now 88.23 is 25 parts out of   (25 + 9)= 
<gadget id="calculator">  (25 + 9)</gadget>
<output>34</output>
34 parts.   Hence 9 parts= 9/25 x 88.23= 31.76   20 kgmount to be added = 31.76 - 11.76= 
<gadget id="calculator">31.76 - 11.76</gadget>
<output>20</output>
20 Kg   20 kgNSWER:20 kg
<result>A</result>
The ratio of sodium chloride to ammonium in 100 kg of mixed ammonium normally used by three chemists is 2: 15. The amount of sodium chloride to be added to 100 kg of mixed ammonium to make the ratio 9 :25 is