В трех стопках по 40 тетрадей. В первую стопку положили еще 18 тетрадей, во вторую-22, а в третью-9.
1) 40х3=120=40+40+40
2) 18+22+9=49=8+22+19
3 120+49=169=120+40+9
Надо решить задачу другим способом.

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