Question 1187540
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together, Thabo and his sister are twenty four years old. 
Three years ago, Thabo was twice as old as his sister was then. 
how old are they now ?
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Three years ago, the sum of their ages was, OBVIOUSLY, 24 - 3 - 3 = 18 years,

AND Thabo was twice as old as his sister.


At this point, it is OBVIOUS, that three years ago Thabo was 12 years old, and the sister was 6 years old.


Hence, now Thabo is 12+3 = 15 years old, while his sister is 6+3 = 9 years old.    <U>ANSWER</U>
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So, &nbsp;the problem is easily solved &nbsp;MENTALLY, &nbsp;using logical reasoning.