81
45 + 18 = 63
x2 + 63
-18
9n + 18 = 81 9n = 63 n = 7
11/42 + 5/18 = 34/63
Using the least common denominator technique: 2/7 = 18/63. 5/9 = 35/63. 18/63 + 35/63 = 53/63. Because 53 is prime, this fraction cannot be reduced further.
6 plus 6 plus 63 plus 63 plus 36 plus 36 is equal to 210.
50 + 63 + 72 + 63 + 137 + 172 = 557
63 - 18 = 45
It is 18.
24 + 63 = 87
2*9=18 7*9=63 9 will go into both 18 and 63