Counting Problems(2)( Week 43 Practice)
1. If it takes 3 seconds to cut a strip from a wire, how many seconds will it take to cut the wire into 6 strips? 2. 20 boys are holding hands each other to make a circle to play a game, and then a girl is introduced between every two adjacent boys. How many girls are there? 3. How many knots are needed to connect 18 short ropes into a circular rope? 4. 10 people are holding hands to make a human chain in a line. How many hands are being held each other? 5. 3 cuts were made to a 20-feet long log into equal pieces. What is the length of each piece (in feet)?