The Brandywine River is at its flood stage of 9 ft. It’s continuing to rain. The next measurement shows that the river has risen 1 1/12ft. ft. An additional measurement shows that the river has risen 1 5/12ft. ft. How many more feet does the river need to rise to be at the major flood stage of 13 ft.? Express your answer in simplest form.(1 point)
To find how many more feet the river needs to rise to be at the major flood stage of 13 ft, we need to add up the total rise in river level.
The initial flood stage is 9 ft, and the river has already risen 1 1/12 ft and 1 5/12 ft.
So the total rise in river level so far is 1 1/12 ft + 1 5/12 ft = 2 2/12 ft.
To find the remaining rise in river level needed to reach the major flood stage of 13 ft, we subtract the total rise so far from the major flood stage:
13 ft - 2 2/12 ft = 13 ft - (2 + 2/12) ft = 13 ft - 26/12 ft = (156/12 - 26/12) ft = 130/12 ft.
Thus, the river needs to rise an additional 130/12 ft to be at the major flood stage of 13 ft.