The answer is 54.
6/7 x 63/1 = 378/7 and simplified that equals 54.
63
It is: 1/7 of 63 = 9
It is: 3/7 of 63 = 27
3/7 of 63 is 27.
36
27
63/7 * 21 = 45/7 * 21 = 45*3 = 135
2/7 of 63 = 63*2/7 = 9*2 = 18
28/63 + 36/63 = 64/63 = 1 and 1/63
5/7 * 63 315/7 = 45 ----------
25/63
28/63