(2 4/15 - 1 5/12) : 3 2/5 + 6 4/9 : 2 =

(8/15 - 5/12)* 1/3 * 2/5 + 6 4/9 * 1/2 =

7/60* 1/3 * 2/5 + 3 4/9=

7/30 * 1/3 * 1/5 + 4/3=

7/450 + 4/3=

607/450