1. Parents weigh 50kg and their two children weigh 30KG. When they meet a river, they must cross it, but the ship can weigh up to 85 kilograms. How can they all cross the river?

2. A guest went to the bakery and bought three cakes, which took 16 minutes to finish baking. A cake should be baked on both sides for 5 minutes 1 face. A * * * has two pots. How can I bake the cake according to the requirements of the guests?

3. A river has 1000 red fish and 1000 goldfish, and there are three bears on the shore. If 1 red fish = 10 goldfish, the bear will eat 500 red fish or 5000 goldfish every day, all goldfish will eat 500 small fish every day, and red fish and goldfish will give birth to half of their present number every day.

4. Both Xiao Ming and Xiao Jun have 1-5 numbers, which are 1 respectively. Every time they eat, they produce a number, and then the sum is invalid. If the sum is 4 times and 4449, why are the last two numbers?

5. Some brain teasers:

A. 1- 1=？ (1) B. Xiao Ming remembered a person's name when he was playing matches. Who is he? (Mao Zedong)

C.7758520 translation? Kiss me, I love you) 9988 174 translation (uncle and father died together)

6. The Chinese teacher said, "The math teacher said that the English teacher said that what the moral teacher said was very reasonable." Who are they repeating?

7. 1+2+3+4+5+6+.......................+44+45+46+47+48+49+50=? Tell me how you worked it out, using simple calculations.

8. 1 well has 1 frog, and the depth of the well is 5m. It climbs 3 meters every day and slides 2 meters at night. When can this frog climb out of this well?

I can't figure it out. There are 50 courses in .............., too many, and I have to do math in the second grade. .............