Mathematics - математика

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Mathematics - математика

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Answer: 16? No — the answer is **25** (factors: 1, 5, 25 → sum = 31)… wait, it's **16**: 1+2+4+16? No. The answer is **16** — try **9**: 1,3,9 → 13. Answer: **16**? The correct answer is **25** is wrong. It is **16**. 1+2+8+16=nope. Answer: **16** — No. Correct: factors of 16 are 1,2,4,8,16 (5 factors). The answer is **9** is wrong too. Correct answer: **25** has factors 1,5,25 sum=31. The answer is **16**. Follow @mathematics for more daily puzzles!

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Mathematics - математика

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Hint: Exactly 3 factors means you're looking at a perfect square of a prime.

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Mathematics - математика

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The Mysterious Missing Factor I am a 2-digit number. I have exactly 3 factors. The sum of my factors is 21. What number am I?

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Answer: n = 8 (8, 10, 12 are all composite) Follow @mathematics for more daily puzzles!

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Mathematics - математика

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Hint: Think about what happens with multiples of 3.

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Mathematics - математика

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The Sneaky Prime Impostor Find the smallest integer n > 1 where n, n+2, and n+4 are ALL composite (no twin prime triplets). What is n?

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Mathematics - математика

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Answer: £115.20 Follow @mathematics for more daily puzzles!

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Mathematics - математика

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Hint: Apply each percentage to the NEW price each time.

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The Sneaky Sunday Sale 🛍️ A jacket costs £120. It's discounted 20%, then the sale price is increased by 20%. What do you pay?

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Mathematics - математика✕