In a camp of 160 students provisions are available for 10 days. If 40 more students join the camp, how long will the provisions last ?
$$No. of men_{1}\times No. of days_{1}$$=$$No. of days_{2}\times No. of days_{2}$$
$$160\times10$$=$$(160+40)\times x$$
$$160\times10$$=$$200\times x$$
$$\Rightarrow$$ x=8 days
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