7
9.7143
If we add 51 and 17 (51 + 17), we'd get 68 for an answer. The number 51 is 50 + 1, and the number 17 is 10 + 7, taking the units digits, 1 + 7 equals 8, and 50 + 10 equals 60. Further, 8 plus 60 is 68, so the sum of 51 and 17 is 68.
9.7143
7
7
68
40 + 7 + 7 + 7 + 7 = 68
45 + 48 = 93
Associativity and commutativity.
-45m + 68 = 84m - 61 39m = 7 m = 7/39
5/7 + 9 = 5/7 + 63/7 = 68/7
So K > 93...
68 + 28x - 28 = 236 28x + 68 - 68 -28 + 28 = 236 - 68 + 28 28x = 196 x = 7
7+0.9+0.03 = 7.93 = 793/100 = 7 and 93/100
68 over 63
The first 5 primes are 2, 3, 5, 7, 11 Their product = 2310. Average of 5 numbers is 55 so their sum is 55*5 = 275. Two numbers, 68 and 93 are added so the new sum of seven numbers is 275 + 68 + 93 = 436 So the new average is 436/7 = 62.3 (to 1 dp).