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World population. The world's population was 6 billion people in 1999. Estimate the world's population in 2099 if it doubles every 45 years

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The time difference between 1999 and 2099 is 100 years.

The population doubles every 45 years.

In 100 years it'll double twice.

From 1999 to 2044 and from 2045 to 2090.

The population will be 6 * 4 = 24 billion people and increasing towards 2099.

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