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This diagram has a heading “Doing.” Underneath, the phrase “number in minutes” is written, followed by an arrow pointing to a box. The box contains the operation “subtract 30.” From the box, an arrow points to a second box with the operation “multiply by 0.2.” From the second box another arrow points to a third box containing the operation “add 25.” From this box an arrow leads to the number 45.

 9.5.4 How Many Minutes for Chatting?