I am an odd number. Remove one letter and I become even. What number am I, Seven (remove “s” → even), I have keys but open no locks. I have space but no room. What am I?, A keyboard (has number keys 0–9), What number becomes bigger when you turn it upside down?, 6 (becomes 9), I am thinking of a number. Double me and add 8 to get 28. What number am I?, 10, I am a shape with no corners, no edges, and the same distance from centre to edge everywhere. What shape am I?, A circle, Which number is the same upside down on a calculator?, 88, I go up but never come down. People measure me every year. What am I?, age, What occurs once in a minute, twice in a moment, but never in a thousand years?, letter m, I am a number. Double me and add 10, you get 50. What am I?, 20, You have a pizza cut into 8 slices. You eat 3/8 of it. How many slices are left?, 5, I have keys but no locks. I have space but no room. You can enter, but can’t go outside. What am I?, keyboard, I am thinking of two numbers. Their sum is 10 and their product is 21. What are the numbers?, 3 and 7, Which weighs more: a kilogram of gold or a kilogram of feathers?, They weigh the same — 1 kg, I am thinking of a number. Subtract me from 20 and the answer is 12. What number am I?, 8, What 3-digit number is the same forwards and backwards, and the sum of its digits is 15?, 555, 3. I am a number. Add me to myself, multiply by 2, and subtract 4 — you get 20. What number am I?, 6, What has numbers but no life, hands but no fingers, ticks but no noise?, clock, 10. If two’s company and three’s a crowd, what are four and five?, 4 + 5 =9, How many months have 28 days?, all months, If I take half of myself and add 5, I become 15. What number am I?, 20, What is full of holes but can still hold water?, sponge, I am a shape with three sides and three angles. What am I?, triangle, How many times can you subtract 5 from 25?, Once — after that, it’s no longer 25, I am a number that reads the same upside down. I am less than 100. Who am I?, 69, 88, 96, I am thinking of two numbers. One is double the other. Their sum is 18. What are the numbers?, 6 and 12, I am a number. Multiply me by myself, subtract me, and the result is 0. What number am I?, 0 or 1, I am always coming but never arrives. What am I?, tomorrow, Two fathers and two sons walk into a room, but there are only three people. How is this possible?, Grandfather, father, and son, I am a number. When you multiply me by any number, the answer is the same as adding me to itself that many times. What number am I?, any number, What is greater than God, more evil than the devil, rich people need it, poor people have it, and if you eat it you die?, nothing

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