Medical researchers have found that the desirable heart rate R, in beats per minute, for beneficial exercise depends on age A, in years, and can be approximated by the formulas $$R = 143 - 0.65A \mbox{ for women}$$ $$R = 165 - 0.75A \mbox{ for men}$$ If the desirable heart rate for a woman is 116 beats per minute, how old is she?
(Note: Give the person's age. For example, if you calculate an age of 45.72 then enter 45 .)

Answer: