Question 1192040
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From the problem statement, we can write:
C + G + U = 258    (C,G,U) = (China, Great Britain, United States)
C = U - 51 
G = U - 54


Substitute for C and G:
(U-51) + (U-54) + U = 258

Combine like terms:
3U - 105 = 258

3U = 363

U = 363/3 = 121  --> C = 70  and  G = 67

Check:  121 + 70 + 67 = 258