Counting Problems(2)( Week 43 Evaluation) 1. If it takes 5 seconds to cut a strip from a wire, how many seconds will it take to cut the wire into 4 strips? 2. 21 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 16 short ropes into a circular rope? 4. 13 people are holding hands to make a human chain in a line. How many hands are being held each other? 5. If it takes 1 minute to cut a log into 2 pieces, how many minutes will it take to cut the log into 14 pieces? 6. It takes 15 minutes to cut a log into 4 pieces. How long will it take for each cut (in minutes)? 7. It takes 4 seconds to tie two pieces of wire together. How many seconds will it take to tie 4 pieces of wire together one after another? 8. A pipe is 8 meters long. How many cuts are needed to cut it into 2 meters long each piece? 9. It costs $3 to make a cut from a steel tube. How much does it cost (in dollar) to cut the tube into 3 pieces? 10. A group of students lined up. Counting from left to right, Ed is the 6th in line; counting from right to left, Ed is the 4th. How many students are there in total?? |