Help with SDN 120 math question calculation

[snakra92]

Can someone please explain how to do number 12 on the SDN 120 calculation?

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[NAPLEXCPJE2014]

You need to use allegation method to solve this problem.
You want to prepare SW Injection containing 10% D using 70% D
70% D. 10 parts ( 10-0=10)
10% D
0% D. 60 parts (70-10=60)

You need to add 70% D to 0% I.e 60 parts of SW (1015 ml of SW)
60 parts is 1015 ml
10 part is 10*1015/60 = 169.17 ml

 

[snakra92]

Thank you so much!