A) 49.50
B) 59.6
C) 69.5
D) 79.8
Correct Answer: C
Solution :
\[\frac{{{P}^{0}}-{{P}_{s}}}{{{P}^{0}}}=\frac{\frac{w}{m}}{\frac{w}{m}+\frac{W}{M}}\] \[\because \,\frac{W}{M}>\frac{w}{m}\] \[\Rightarrow \frac{640-600}{640}\] \[=\frac{w}{m}\times \frac{M}{W}\Rightarrow \frac{40}{640}=\frac{2.175\times 78}{m\times 39.08}\] ; \[m=\frac{2.175\times 78}{39.08}\times \frac{640}{40}\] \[m=69.45\].
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