师徒二人加工一批零件,师傅加工的零件比总数的1/2还多15个,徒弟加工的零件数是师傅的1/3,这批零件共有?
8个回答

(15+15×1/3)÷(1-1/2-1/2×1/3)

=20÷1/3

=60个