15.
5 - -10 = 5 + 10 = 15
→ 15 + -10 = 15 - 10 = 5
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let x be the number, then: (x + 1) × 2 + 5 = x + 1 → 2x + 2 + 5 = x + 1 → 2x + 7 = x + 1 → 2x - x = 1 - 7 → x = -6 The number is -6. Checking: -6 +1 = -5; 5 × 2 = -10; -10 + 5 = -5 which is the same as -6 + 1 = -5.
23 + 2X = 5 2X = -18 X = -9
Let x = the numbernumber increased by 10 = x + 10
2 -> 9 = +79 -> 5 = -45 ->13 = +813 -> 10 = -310 -> 19 = +919 -> 17 = -2As you can see, every other time, the number is increased. It was originally increased by 7, then 8, then 9. So, the next number should be increased by 10 = 27
It will be 22348.