How old is Petra?
Algebra
Level
1
if Petra is 2 years old and is half as old as her sister,
how old will Petra be when her sister is 100 years old?
The answer is 98.
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Petra is 2 and her sister is (2 x 2)=4
[if Petra is 2 years old and is half as old as her sister]
so,their age difference is 2.
so,when her sister will be 100, she will be (100 -2)=98 years old.