Abag with 2 1/6 ounces of peanuts can make 2/5 of a jar of peanut butter. it can make a full jar with how many ounces of peanuts?

Look at the figure below: triangle abc is a right triangle with angle abc equal to 90 degrees. the length of ac is 5 units and the length of ab is 4 units. d is a point above c. triangle adc is a right triangle with angle dac equal to 90 degrees and dc parallel to ab. what is the length, in units, of segment cd?