Answer: How many minutes does it take to saw a piece of wood into 3 pieces and 5 pieces? 2, a 20-meter path, planting trees on both sides, planting one tree every 4 meters, how many trees does a * * * need? 3. In the subtraction calculation, the sum of the minuend, the subtraction and the difference is 80, and the difference is larger than the subtraction 14. What is the difference? The bison is 240 meters in front of the Northeast Tiger. Bison can run 20 meters per second, and Siberian tiger can run 30 meters per second. How soon can the Siberian tiger catch up with the bison? 5. Processing a batch of parts, originally planned to be completed in 40 hours, 12 people. After the actual work 10 hour, due to the urgency of the task, eight more people were added, so that it could be completed several hours in advance. 6. Little Red Birthday 12. Grandpa said: Xiaohong, it's very kind of you to celebrate your birthday every year! Although tomorrow is grandpa's birthday, Xiaohong's birthday is only twice as small as grandpa's. Do you know why? When is Xiaohong's birthday? How old should grandpa be? 7. There is a rope. For the first time, half of the total length was used, and for the second time, the remaining half was more than four meters, leaving nine meters. How long is this rope? 8. Xiao Ming The age of father and grandfather is 106. Grandpa is 24 years older than dad, and grandpa and dad are 86 years older than Xiaoming. How old are they? 9. A basket of eggs sold more than half of the four for the first time, less than three for the second time, and half for the third time. Finally, there are four eggs left in the basket, and there are still several eggs in the basket. 1 0,2001April1is Thursday. What day is June 1st?