Question

You add 4 foot section of land to a 6 six foot by 8 foot garden. Find the area of the new garden

Answer 1

Area = W x L
The area of the new garden depends on how the 4 foot section is added.
If added to the 6 foot side, the 6 foot becomes 10 feet and the area would be 80 sq feet.  
But it is perhaps more likely the 8 foot side was lengthened to 12 feet and the new garden would have an area of 72 sq feet.