Logical Puzzles

5. Gill’s puppy was growing fast. In the first five days since she got it it had eaten 100 dog biscuits. If each day it had eaten 6 more than the previous day, how many biscuits had it eaten on the first day?
8 Biscuits.
6. If two men stand back to back, walk in opposite directions for 4 metres, turn to the left and walk another 3 metres, what is the distance between them when they stop?
10 metres