Turtles Žofka and Julka

Gray wolf kept in his tent turtles Žofka and Julka, which together have 200 years. After 50 years will Julka 2 times older than Žofka. How old are the turtles?

Correct result:

x =  150
y =  50


x+y= 200; x+50 =2(y+50)

x+y= 200
x+50 =2•(y+50)

x+y = 200
x-2y = 50

x = 150
y = 50

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