A biologist studied the population of rats in a barn. Initially the number of rats were $200$ . Now $15$ new rats were born and mortality was $20$ . So, what will be the final population?

200

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195

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220

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185

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Solution

The correct option is D $195$
Initial population $= 200$
Mortality $= 20$
Natality $= 15$
Final population = Initial population - (Mortality + Natality)
So, $200 - (20 + 15) = 195$

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A biologist studied the population of rats in a barn. Initially the number of rats were 200. Now 15 new rats were born and mortality was 20. So, what will be the final population?

The correct option is D 195Initial population =200Mortality =20Natality =15Final population = Initial population - (Mortality + Natality)So, 200−(20+15)=195

A biologist studied the population of rats in a barn. Initially the number of rats were $200$ . Now $15$ new rats were born and mortality was $20$ . So, what will be the final population?

The correct option is D $195$
Initial population $= 200$
Mortality $= 20$
Natality $= 15$
Final population = Initial population - (Mortality + Natality)
So, $200 - (20 + 15) = 195$