leon wanted to know the age of a black
bear at the zoo. the zookeeper told leon
that if he added 10 years to the age of the
bear and then doubled it, the bear would
be 90 years old. how old is the bear?
(hint: using the facts given, start with 90
years and work backwards.)
(

The bear is 35 years of old now.

Step-by-step explanation:

Leon wanted to know the age of the black bear at the zoo.

He is informed that if he adds 10 years to the age of the bear and then doubles it, the bear would be 90 years old.

Let the present age of the bear is x years.

So, according to the above condition we can write  

2(x + 10) = 90

⇒ 2x + 20 = 90

⇒ 2x = 70

⇒ x = 35  

So, the bear is 35 years of old now. (Answer)

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step-by-step explanation: