Solution:

Draw an S in front of the IX and it spells SIX. No one said the line had to be straight.

Solution:

They are matched as shown in the picture below.

Solution:

They used the planks in the manner that is shown in the figure.

Solution:

Daughter.

Solution:

Sansa has the siamese (conjoined) twin sister.

Solution:

White should move the rook from
A1 to D1 and hence complete the castling move.

Solution:

They use the bricks and dirt from the tunnel to stand on it.

Solution:

457730 * 4 = 1830920
(DOLLAR * 4 = QUARTER)

Solution:

17 min

The initial solution most people will think of is to use the fastest person as an usher to guide everyone across. How long would that take? 10 + 1 + 7 + 1 + 2 = 21 minutes. Is that it? No. That would make this question too simple even as a warm up question.

Let's brainstorm a little further. To reduce the amount of time, we should find a way for 10 and 7 to go together. If they cross together, then we need one of them to come back to get the others. That would not be ideal. How do we get around that? Maybe we can have 1 waiting on the other side to bring the torch back. Ahaa, we are getting closer. The fastest way to get 1 across and be back is to use 2 to usher 1 across. So let's put all this together.

1 and 2 go cross
2 comes back
7 and 10 go across
1 comes back
1 and 2 go across (done)

Total time = 2 + 2 + 10 + 1 + 2 = 17 minutes

Solution:

The driver is actually the wife and mother.

Solution:

In the picture you can find the green matchsticks. We have moved them from the bottom and placed them in the middle. It was a bit tricky but now you have your desired result.