Mr and Mrs

Mr. Calda and Mrs. Cald have a total of 139 years. How many years have when we know that Mr. Calda is 9 years older than Mrs. Cald

Correct result:

a =  74
b =  65

Solution:


a+b = 139
a = 9 + b

a+b = 139
a-b = 9

a = 74
b = 65

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