IKMC 2027 - Grades 5-6 - Self-study SET 6 - Thematic Batch 3 Question 11

Four flowers have 4,5 or 6 petals. Five-petalled flowers always lie; four- and six-petalled flowers always tell the truth. Red claims their total is 17, orange 18, yellow 21 and pink 22. Exactly one tells the truth. Which colour is it?