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Hi, Here its given that

11 ≤ B ≤ 20
7 ≤ C ≤ 12

equal to = 18 ≤ B + C ≤ 23 - but 20 + 12 = 32. If are given limit is 23, then how and why are we adding the two.
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Hi, Here its given that

11 ≤ B ≤ 20
7 ≤ C ≤ 12

equal to = 18 ≤ B + C ≤ 23 - but 20 + 12 = 32. If are given limit is 23, then how and why are we adding the two.
Because A must get at least 22 hours, at most 45 - 22 = 23 hours remain for B and C together. So even though 20 + 12 = 32, total hours limit B + C to 23.
That’s why we use 18 ≤ B + C ≤ 23.
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I like the solution - it’s helpful.
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