Q81: What is the next number in this pattern: 1, 3, 9, 27, ...?
Answer: 81
💡 Each number in the pattern is three times the number before it, so after 27 comes 27 × 3 = 81.
844 questions and answers — page 5 of 43
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Answer: 81
💡 Each number in the pattern is three times the number before it, so after 27 comes 27 × 3 = 81.
Answer: 81
💡 Add what was subtracted to the result: 4 + 77 = 81; check: 81 - 77 = 4.
Answer: 26
💡 In the number 26, the tens digit is 2 and the ones digit is 6, and 6 = 3 × 2, and their sum is 2 + 6 = 8.
Answer: 40
💡 Half of 40 is 20 and a quarter of it is 10, and together they make 20 + 10 = 30.
Answer: 16
💡 Reverse the steps: 25 + 7 = 32, then half of 32 is 16; check: 16 × 2 - 7 = 25.
Answer: 118
💡 If half of the number is 59, the whole number is double that: 59 × 2 = 118.
Answer: 9
💡 Work backward step by step: 32 - 5 = 27, then 27 ÷ 3 = 9; check: 9 × 3 + 5 = 32.
Answer: 90
💡 Subtract what was added from the result: 104 - 14 = 90; check: 90 + 14 = 104.
Answer: 4 wings
💡 A bee has two pairs of wings: two big front wings and two smaller back wings. They hook together with tiny hooks during flight, so they look like just two wings.
Answer: The strength of earthquakes
💡 The Richter scale estimates the strength of an earthquake from the energy it releases, and each step on it means a much stronger earthquake than the step before.
Answer: The sea otter
💡 Sea otters sleep floating on their backs, and some hold hands or wrap themselves in seaweed so the current doesn't carry them away.
Answer: 21, then 57, then 70, then 75
💡 We compare the numbers by their tens place first: 21, then 57, then 70. Since 70 and 75 have the same tens, we compared the ones, so 70 comes before 75.
Answer: Anqa' (phoenix)
💡 The Arabs said: the impossible things are three: the ghoul, the anqa' (phoenix) and the faithful friend. The ghoul and the anqa' are imaginary creatures, and the faithful friend is a loyal companion who is rarely found.
Answer: Daydreams
💡 Daydreams are fantasies a person drifts into while awake, while nightmares are upsetting dreams during sleep.
Answer: The rapid eye movement (REM) stage
💡 In the rapid eye movement (REM) stage, the brain is active and the eyes move quickly under the eyelids, and that is when most vivid dreams happen.
Answer: =
💡 The two numbers are exactly equal (355 and 355), so the correct sign between them is "=".
Answer: Pizza ↔ Italy, Sushi ↔ Japan, Tacos ↔ Mexico, Kabsa ↔ Saudi Arabia
💡 These dishes have spread all over the world, but their known origins are: pizza from Italy, sushi from Japan, tacos from Mexico, and kabsa from Saudi Arabia and the Gulf.
Answer: Kiwi ↔ New Zealand, Giant panda ↔ China, Lemur ↔ Madagascar, Llama ↔ South America
💡 Each of these animals has an original home where it lives in the wild: the kiwi in New Zealand, the giant panda in the mountains of China, the lemur only on the island of Madagascar, and the llama in the Andes Mountains of South America.
Answer: France
💡 The Palace of Versailles near Paris was the seat of the kings of France, and it is famous for its Hall of Mirrors and vast gardens.
Answer: Milligram, then Gram, then Kilogram, then Ton
💡 A gram has 1000 milligrams, a kilogram has 1000 grams, and a ton has 1000 kilograms.