IKMC 2027 - Grades 5-6 - Self-study SET 10 - Thematic Batch 3 Question 7

Simon weighs a peach on a two-pan balance using weights of 1 g, 3 g, 9 g, 27 g and 81 g. He places the peach on one pan and adds weights until the balance is level, finding that the peach weighs 61 g. Which weights are on the peach’s pan?