7
Without a specific number, all of the numbers in that range are multiples.
17, 34, 51, 68, 85
Any number between 51 & 99 inclusive.
They are 34 and 51.
It is: (100+51)/2 = 75.5
51 54 57
There are ten prime numbers between 51-100.
2.51 as a mixed number is 2 51/100
Multiples of 51
The GCF of any set of numbers implies that all numbers in the set are multiples of the GCF. The multiples of 17 are 17,34,51 etc. If the greater number is 51 (which is an odd number) then the only solution for the other number (which is even and less than 51) is 34.
.51
All the multiples of 5 between 1 and 51 are: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50 These add up to 275.