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 5 strips? 2. 16 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 13 short ropes into a circular rope? 4. 11 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 20 pieces? 6. It takes 8 minutes to cut a log into 5 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 10 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 5 pieces? 10. A group of students lined up. Counting from left to right, Steve is the 7th in line; counting from right to left, Steve is the 5th. How many students are there in total?? |