Puzzle 040: Fill the Reservoir

ナゾ０４０　満タンの貯水池
この貯水池では４台のポンプを使って
湖の水を貯水池に移している。
その４台は１台で運転したときに、それ
ぞれが３日、６日、１０日、１５日で
貯水池を満杯にする能力があるという。
この４台のどれかと同じポンプを、
もう１台追加して、丸１日で貯水池を
ちょうど満杯にしたい。
どのポンプを追加すればよいのだろう？

Google Translate
This reservoir has four water reservoirs are moving into the lake with a single pump. When one of its four operating units are units, each 3, 6, 10, 15 that have the ability to fill the reservoir in the day. This same pump was one of four units, and add another one, just fill the reservoir to round one day. Wonder how do I add a pump?

Notes on Puzzle
You need to fill a reservoir with water. You have four pumps. One pump will fill the reservoir in 3 days; one in 6 days; one in 10 days; one in 15 days. If you want to fill the reservoir in 1 day, you could turn on all the pumps at the same time, but you need one more pump to do it. Is a 3-day pump, 6-day pump, 10-day pump or 15-day pump?

Puzzle 038: Above-and-Below Maze

ナゾ０３８　裏表の迷路
表と裏に迷路が作られたおもちゃが
ある。表の迷路のスタートから移動を
開始して、穴に落ちると裏の迷路に
切り替わる仕掛けた。
うまく、ゴールまでたどり着けるかな？

Google Translate
There are toys made in the front and back of the maze. To start moving the table from the start of the maze, planted in a maze of switches back and fall into a hole. Well, that what people get to the finish?

Notes on Puzzle
This toy is like Labyrinth on crack. You have to maneuver a ball around a maze, however, when it drops through a hole the maze swaps to the other side, which has a different arrangement of maze walls. You have to guide the back to the goal space in the bottom right. You can apparently do this in as few as 8 moves.

Puzzle 018: 10 Lamps

ナゾ０１８　１０本の街灯
深夜の道路に１０本の街灯が並んで
光っている。
実は不良品お電球を使っていたらしく
２時間に１つの割合で電球が切れる。
一方、３時間ごとに見まわりが現れて、
１つだけ電球を取り替えていく。
１２時間後には、いったい何本の街灯が
点灯しているだろう。

Google Translate
10 late-night road street lights that lined the book shines. Your generous with defective light bulbs actually run out of two hours at a rate of one light bulb. Meanwhile, look around should come up every three hours, only one will replace one light bulb. After 12 hours, the street lights would have illuminated this gas.

Notes on Puzzle
A puzzle about 10 street lamps at night. Every two hours, one of the lamps will burn out. Every 3 hours, someone will come by and replace a burnt out lamp. After 12 hours, how many lamps will still be burning?

Puzzle 016: The Husband's Changes

ナゾ０１６　変わった夫
ある夫婦が海外旅行に出かけた。
１ヵ月後、帰宅した２人を見た隣人は
妻に対しては何も言わず、夫に対して
「ずいぶん見かけが変わりましたね！」
と、しきりに言った。
だが夫婦は出かけたときと服装も髪型
も体重も全く変わっていないという。
いったい誰の何が変わったのだろう？
ひらがな２文字で答えてほしい。

Google Translate
A couple went on an overseas trip. One month later, a neighbor saw two men went home to his wife without saying anything against her husband, "I changed my appearance a lot!" Said eagerly. Husband and wife but his weight has not changed at all when the hair and clothes and went out. Who will wonder what changed? Want to answer two hiragana characters.

Notes on Puzzle
A couple go travel abroad for a month. When they return their neighbor says, “You really look different!” However, their clothes, hair, and weight haven't changed, so what is the neighbor referring to? The answer is a two-hiragana word. I think there is an additional clue – the title of the puzzle is “The Husband's Changes” so you know the answer has to do with the guy. Once I realized that the answer was fairly straightforward.