I need help knowing how to find the name of the element. I am able to do the calculations to find the relative atomic mass of the element. Please help.

Isotope ?-35 has an atomic mass of 35.
75% of all atoms of element ? are of this form.

Isotope ?-37 has an atomic mass of 37.
25% of all atoms of element ? are of this form.

What is the relative atomic mass of the element?
Now, what is this element's name?