Davindra, who is 15 years old, is one year older than twice the age of her younger sister, Preetha. How do you find the age of Preetha and justify each step?

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Answer 1 · 2017-01-11T04:39:23

Preetha's age is #7# years.

We consider Preetha's age as #x#, since it is an unknown figure.

From the given data, we know Davindra's age and also how it compares to Preetha's age. Hence, we can write:

#2x+1=15#

Subtract #1# from each side.

#2x=14#

Divide both sides by #2#.

#x=7#