Somewhere Between Frankfurt and Singapore on A380

In one section of the aircraft A-380, passenger seats are arranged in 3s and 4s. There are two blocks of 9 rows of 3 seats and a middle block of 10 rows of 4 seats.

How many passenger seats are there in this section?

New York Tomatoes

In some parts of the world, people use pounds (lb) instead of kilograms (kg). This is a photograph of a shop along Broadway in New York City.

Explain how you can find the cost of 6 lbs of these tomatoes (before taxes) without using a calculator.

Chile Car Plates

The older cars have two letters followed by 4 digits while the newer cars have four letters followed by 2 digits.
Assuming that all the letters and digits can be used, find the number of different car registration plates that can be issued by the older method.

Suggest a reason why the new method uses 4 letters followed by 2 digits.