Cicadas are insects that live underground and emerge from the ground after X or x+4 years. Is it possible that both X and x+4 are prime? My brain is melting, help.

Isabelle is mixing red and blue paint to make purple paint she adds 3/10 of a fluid ounce of red to 12/25 of a fluid ounce of blue to make 1 1/30 fluid ounces of purple how many fluid ounces of red paint ounces of red paint will she need to make 3 fluid ounces of purple paint