Bracket #19 — the answers

The five questions from October 18, 2026, with their answers, the track each ran on, and the bracket that would have scored 90 on it.

The answers

Question by question

A question scores 100 minus the bracket’s width as a percentage of the track, if the answer is inside it, and nothing if it is outside. The tenth-of-the-track bracket below is the one a confident player was aiming for.

1. How much did the original iPhone weigh? 135 grams — in the lower third of its track. A bracket from 120 to 155 is a tenth of the track and scores 90; the whole track scores 0.
2. How many stripes are on the US flag? 13 — in the lower third of its track. A bracket from 10.5 to 15.5 is a tenth of the track and scores 90; the whole track scores 0.
3. How deep is Lake Baikal, the deepest lake in the world? 5,387 feet — in the lower third of its track. A bracket from 4,400 to 6,400 is a tenth of the track and scores 90; the whole track scores 0.
4. How many baby teeth does a child get? 20 — near the middle of its track. A bracket from 18 to 22.5 is a tenth of the track and scores 90; the whole track scores 0.
5. How many hours are in 20 weeks? 3,360 — in the upper third of its track (a logarithmic track, so a tenth of it is a tenth of the powers of ten it spans). A bracket from 2,700 to 4,200 is a tenth of the track and scores 90; the whole track scores 0.

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About Bracket

Bracket is Noggin’s estimation puzzle, on the second shelf: five questions a day with a number for an answer, bracketed rather than named, outside the daily line-up. How to play Bracket, or play today’s.