1 / 15 * 4 / 3 + 5 / 6 * 4 / 15 + 4 / 9 * 2 / 15 =? Simple operation!

1 / 15 * 4 / 3 + 5 / 6 * 4 / 15 + 4 / 9 * 2 / 15 =? Simple operation!

=4/15*(1/3+5/6+2/9)
=4/15*(6/18+15/18+4/18)
=4/15*25/18
=2/3*5/9
=10/27