AMO 2027 Grades 2-3 SET 10 - Self-study Question 3

Alice loves roses. In her rose garden she has half as many pink roses as red, and four times as many red ones as white. There are 36 roses that are either yellow or white. Twenty are yellow. How many roses are in Heather’s garden?

Self-study correction (editorial): treat Heather as a mistaken name for Alice, referring to the same garden. Find its intended total.