Question 1102545
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The condition says


    NorthAmerica + Europe + Asia  = 21,

    NorthAmerica - (Europe + Asia) = 5.


Add the two equations. You will get

2*NorthAmerica = 21+5 = 26  ====>  NorthAmerica= {{{26/2}}} = 13.


Then (Europe + Asia) = 21 - 13 = 8.



Next, you have these two equations

    Europe + Asia = 8,

    Europe - Asia = 4.


Add the two equations. You will get


2*Europe = 8+4 = 12  ===>  Europe = {{{12/2}}} = 6.


Then Asia = 8-6 = 2.


<U>Answer</U>.  NorthAmerica = 13, Europe = 6  and  Asia = 2.
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Solved.