Post a riddle!
- 主题发起人 Alper_Tunca
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Here's one.
An insurance salesman walk up to a house and knocks on the door. A woman answers, and he asks her how many children she has and how old they are. She says "I'll give you a hint. If you multiply the ages of my three children, you get 36." He says this is not enough information, so she gives a him second hint: "If you add up their ages, the sum is the number on the house next door." He goes next door and looks at the house number and says this is still not enough information. So she says she'll give him one last hint which is that her oldest of the three plays piano.
How old are her kids?
An insurance salesman walk up to a house and knocks on the door. A woman answers, and he asks her how many children she has and how old they are. She says "I'll give you a hint. If you multiply the ages of my three children, you get 36." He says this is not enough information, so she gives a him second hint: "If you add up their ages, the sum is the number on the house next door." He goes next door and looks at the house number and says this is still not enough information. So she says she'll give him one last hint which is that her oldest of the three plays piano.
How old are her kids?
I'd like some explaining on some of that. How did the neighbour's house number actually count in at all? So it's one (or two? some house numbers have odds one one side and evens on the other) away from an unknown number? And I might not be knowledged enough about pianocraft, but how was that a hint?
J 说:
I think the significance of that was it meant there had to be one child older than the others (the riddle specifies that her oldest plays piano), as opposed to two or more of them being the same age. So it meant, for example, that they couldn't have been 6, 6 and 1 year old (another combination that would have given 36).
Youcrodio 说:
First, find sets of 3 numbers that when multiplied produce 36J 说:
1*1*36
1*2*18
1*3*12
1*4*9
1*6*6
2*2*9
2*3*6
3*3*4
1*2*18
1*3*12
1*4*9
1*6*6
2*2*9
2*3*6
3*3*4
1+1+36 = 38
1+2+18 = 21
1+3+12 = 16
1+4+9 = 14
1+6+6 = 13
2+2+9 = 13
2+3+6 = 11
3+3+4 = 10
The bold sums are the same, so with only this information it could be either of those two
1+2+18 = 21
1+3+12 = 16
1+4+9 = 14
1+6+6 = 13
2+2+9 = 13
2+3+6 = 11
3+3+4 = 10
The bold sums are the same, so with only this information it could be either of those two
"Oldest" implies there is one child older than the others, but we have the triples 1,6,6 and 2,2,9. The first triple wouldn't work, because the two older children are of the same age. Therefore it must be the second triple, 2,2,9.
Saying "the house next door" and "plays piano" is deliberate, as it's distracting from what might otherwise be a rather straight-forward math problem. Speaking of math problems, this one is old but I still like it:
A bear walks one mile south, one mile west, and one mile north, ending up right where he started. What color is the bear?
White, it's a polar bear.
What vehicle is spelled the same whether spelled forwards or backwards?
What vehicle is spelled the same whether spelled forwards or backwards?
good, carry on.
These are supposed to be riddles, not the ****ing Countdown numbers round.
