You are packing presents. You cut a ribbon every 40 inches, and you have 7 pieces. There are 30 inches of ribbon left. How long was the ribbon at first?

The ribbon was 310 inches long at first.

Step-by-step explanation:

First, we will determine the length of ribbon that was cut.

From the question,

You cut a ribbon every 40 inches, that is, the length of each ribbon is 40 inches

Since, we have 7 pieces of ribbon, then total length of the ribbon that was cut will be

40 inches × 7

= 280 inches

This the total length of ribbon that was cut from the initial length of ribbon.

Now, after cutting 7 pieces of ribbon, there are 30 inches of ribbon left,

To determine how long the ribbon was at first,

we will sum the total length of ribbon that was cut from the initial length to the remaining length of ribbon after cutting, that is

280 inches + 30 inches

= 310 inches

This is the initial length of the ribbon.

Hence, the ribbon was 310 inches long at first.

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step-by-step explanation: