4/5 of sarahs pens are equal to 1/3 of matt's pens. express the number of matt's pens as a fraction of the total number of pens he and sarah have

Maria donates a fixed amount, a, to a charity each month. if she donates $300 in 12 months, what is the equation for a? a. a + 300 = 12 b. a × 300 = 12 c. a × 12 = 300 d. a + 12 = 300 e. a + 32 = 100