It is so very simple and quick to get the answer, especially since you can use the calculator that comes with your computer. But since you are not able to do so, the answer is 344.
21.5 x 4 = 86
No.
345/4= 86. 25 or 86 remainder 1
21 times with a remainder if 2 or 21.5 times
423 divided by 86 equals 4 with a remainder of 79.
4 with remainder 6.
-86
The answer is 7396
the rule is times by 4 minus 2. The next number is 86.
0.0465
Exactly 86 times
54 * 64 * 86 = 247,680