23 is an odd number between 10 and 30 that gives a remainder of 2 when divided by 7.
8.
0.6667
69.
89
221 is the smallest number which when divided by 24 36 and 54 gives a remainder of 5 each time
8
12 is the smallest whole number that gives a remainder of 4 when it is divided by 8.
8.
0.6667
3
23, 58, 93, 128, 163, 198, ...
40
3 divided by 2 goes once, remainder one.
172
69.
89
No. Add the digits of the dividend and if that is divisible by 3 then the original number is divisible by 3; if not, its remainder when divided by 3 gives the remainder when the original number is divided by 3: 1 + 2 + 1 = 4 which gives a remainder of 1 when divided by 3, so 121 divided by 3 gives a remainder of 1. (121 = 40 x 3 + 1)