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प्रश्न
In a barn, there were 30 rats. 5 more rats entered the barn and 6 of the rats were eaten by the cats in one week. If 8 rats were born during the same period, and during the same time, 7 rats left the barn, find the resultant rat population in the barn at the end of one week.
संख्यात्मक
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उत्तर
Initial rat population = 30
Increase in population = Rats entered + Rats born
= 5 + 8
Decrease in population = Rats eaten + Rats left
= 6 + 7
Resultant population after one week = 30 + [(5 + 8) – (6 + 7)]
= 30 + (13 – 13)
= 30
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