( 6 3/4 - 5 1/6 : 1 9/32) × 5/10.

6 3/4 -5 1/6= 27/4 - 31/6 = 81/12 - 62/12=19/1219/12:1 9/32=19/12*32/41=608/492=152/1235/10*152/123=760/1230=76/123