Since the beginning of 1990, the number of squirrels
in a certain wooded area has tripled during every
3-year period of time. If there were 5,400 squirrels in
the wooded area at the beginning of 1999, how many
squirrels were in the wooded area at the beginning
of 1990 ?

Equation: A declaration that two expressions with variables or integers are equal. In essence, equations are questions and attempts to systematically identify the solutions to these questions have been the driving forces behind the creation of mathematics.

Given the year1999 there are 5400 squirrels ------ (1)

The beginning year of 1990,

Assume the number of squirrels is 'x'.

Every three years period of time the number of squirrel is tripled.

That means 1993=3x

⇒1996=9x

⇒1999=27x ---- (2)

Comparing (1) and (2) equations, we get

27x=5400

⇒x =5400 ÷ 27

⇒x=200

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Since the beginning of 1990, the number of squirrels in a certain wooded area has tripled during every 3-year period of time. If there were 5,400 squirrels in the wooded area at the beginning of 1999, how many squirrels were in the wooded area at the beginning of 1990 ?

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Since the beginning of 1990, the number of squirrels
in a certain wooded area has tripled during every
3-year period of time. If there were 5,400 squirrels in
the wooded area at the beginning of 1999, how many
squirrels were in the wooded area at the beginning
of 1990 ?