Bracket #4 — the answers
The five questions from October 3, 2026, with their answers, the track each ran on, and the bracket that would have scored 90 on it.
The answers
| # | Question | Answer | Track | A tenth of it, on the answer |
|---|---|---|---|---|
| 1 | How many black keys are on a piano? | 36 | 10 to 100 | 31.5 to 40.5 |
| 2 | How fast can a cheetah run? | 65 miles per hour | 10 to 200 | 56 to 74 |
| 3 | How many dominoes are in a double-six set? | 28 | 5 to 100 | 23.5 to 33 |
| 4 | How many laps is the Indianapolis 500? | 200 | 20 to 1,000, logarithmic | 160 to 240 |
| 5 | What do the whole numbers from 1 to 60 add up to? | 1,830 | 100 to 100,000, logarithmic | 1,300 to 2,600 |
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.
- How many black keys are on a piano? 36 — in the lower third of its track. A bracket from 31.5 to 40.5 is a tenth of the track and scores 90; the whole track scores 0.
- How fast can a cheetah run? 65 miles per hour — in the lower third of its track. A bracket from 56 to 74 is a tenth of the track and scores 90; the whole track scores 0.
- How many dominoes are in a double-six set? 28 — in the lower third of its track. A bracket from 23.5 to 33 is a tenth of the track and scores 90; the whole track scores 0.
- How many laps is the Indianapolis 500? 200 — near the middle of its track (a logarithmic track, so a tenth of it is a tenth of the powers of ten it spans). A bracket from 160 to 240 is a tenth of the track and scores 90; the whole track scores 0.
- What do the whole numbers from 1 to 60 add up to? 1,830 — near the middle of its track (a logarithmic track, so a tenth of it is a tenth of the powers of ten it spans). A bracket from 1,300 to 2,600 is a tenth of the track and scores 90; the whole track scores 0.
Previous: Bracket #3 (Fri, Oct 2)
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.