Question 1201109
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        This problem is good for mental solution in couple of lines.



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Indeed, in 10 years from now, Ral will be twice Shein's age, and the sum of their ages will be 28+10+10 = 48.


If one of the numbers is twice the other number and their sum is 48, then the numbers are 16 and 32:


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   | it is how a human brain should react automatically on such information |
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Hence, the Ral age is 16-10 = 6 years now, 
while the Shein age is 32-10 = 22 years now.
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Solved.