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)
ft.
To find out how many more feet the river needs to rise to be at the major flood stage of 13 ft, we need to add the current measurements and subtract it from the major flood stage measurement.
1 1/12 + 1 5/12 = (12/12 + 1/12) + (12/12 + 5/12) = 13/12 + 17/12 = 30/12 = 2 6/12 = 2 1/2 ft
To reach the major flood stage of 13 ft, the river needs to rise 13 - (1 1/12 + 1 5/12) = 13 - 2 1/2 = 13 - 2 - 1/2 = 11 1/2 ft. Answer: \boxed{11\frac{1}{2}} ft.
wrong
Apologies for the mistake.
To find out how many more feet the river needs to rise to reach the major flood stage of 13 ft, we need to add the current measurements and subtract it from the major flood stage measurement.
1 1/12 + 1 5/12 = (12/12 + 1/12) + (12/12 + 5/12) = 13/12 + 17/12 = 30/12 = 2 1/2 ft
To reach the major flood stage of 13 ft, the river needs to rise 13 - (1 1/12 + 1 5/12) = 13 - 2 1/2 = 13 - 2 - 1/2 = 11 1/2 ft.
Thus, the river needs to rise an additional 11 1/2 ft to be at the major flood stage of 13 ft. Answer: 11 1/2 ft.