[2] There are 8 cards with numbers 0, 3, 4, 5, 6, 7, 8, and 9 on them. These 8 cards were put in a box. You are asked to randomly pick up two cards each time to form a two-digit number. How many different two-digit numbers can you form?

[4] Niconia walked at 33 yards per minute, Richard walked at 36 yards per minute, and Ed walked at 37 yards per minute. Niconia and Richard walked towards place B from place A, and Ed walked towards place A from place B. All three started at the same time. Ed met Richard first, and 3 minutes later he met Niconia. How far is the distance between place A and place B (in yards)?

[6] Ed started out at an average speed of 40 meter/minute from place A to place B. At the same time, Ben started out from place B to place A. When they met, Ed still needed 5 more minutes to get to place B, and Ben was 80 meters from place A. What is Ben's speed in meter/minute?

[8] There is an apple tree in the back yard at Helen's house. On the 1st day, she picked

1

6

  of all the apples in the tree; On the 2nd day, she picked

1

5

  of all the apples remaining in the tree; On the 3rd day, she picked

1

4

  of all the apples remaining in the tree; On the 4th day, she picked

1

3

  of all the apples remaining in the tree; After 4 days, there are 10 apples left in the tree. How many apples were there in the tree to begin with on the 1st day?

[10] From the natural numbers 1 to 63, pick any two numbers whose sum is less than 64. How many ways are there to pick?