What are some isotopes used in cancer treatment and magnetic resonance imaging (mri) and how is the isotope used to achieve its function ?

One major use of radioisotopes is in nuclear medicine. Of the 30 million people who are hospitalized each year in the United States, 1/3 are treated with nuclear medicine. More than 10 million nuclear-medicine procedures are performed on patients and more than 100 million nuclear-medicine tests are performed each year in the United States alone. A comparable number of such procedures are performed in the rest of the world.

Adozen is 1221/12 = 1.751.75 x 12 = 21therefore, 1.75 is the answer.