Answer:
Number of gives added = 30 \[\therefore \] Now total number of girls \[=\text{ }50\text{ }+\text{ }30\text{ }=\text{ }80\] For more number of girls, the food will last less number of days \[\therefore \]It is a case of inverse proportion \[50\times 40=80\times x\] \[x=\frac{50\times 40}{80}=25\] Therefore, the food will now last for 25 days.
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