Skip to main content

This diagram has a heading “Undoing.” The number 45 is followed by an arrow which points to a box. The box contains the operation “subtract 25.” The output from this operation is 45 – 25 = 20 and a further arrow with the answer 20 above it points to a second box. This box contains the operation “divide by 0.2.” The output from this operation is 20 divided by 0.2 = 100 and a further arrow with the answer 100 above it points to a third box. This box contains the operation “add 30” and a further arrow points to the answer 130 (since 100 + 30 = 130).

 9.5.4 How Many Minutes for Chatting?