A grey squirrel population was introduced in a certain county of Great Britain 35 years ago. Biologists observe that the populat ion doubles every 7 years, and now the population is 60,000.
2 answers:
If this occurred over a span of 35 years and the population doubles every 7 years, we can divide 35 by 7 to find how many times the population has doubled, which would be 5 times. If we divide 60,000 by 2 (or multiply by 1/2) 5 times, you would get the answer, which would be 1,875.
it is 5 periods - 7 years each, 5*7 =35 years
120000-->60000-->30000-->15000-->7500-->3750
Initial population was = 3750 squirrels
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