1. Bamboo increased by about 4 cm per hour in vigorous growth period, and bell fungus grew faster, and increased by 25 cm per hour and month in vigorous growth period. If they are all in the vigorous growth period, the height of bamboo is 32 cm at first, and the height of fungus is 0.5 cm. After a few hours, can tremella catch up with bamboo in height?

Solution: Assume that the height of bell fungus can catch up with bamboo after X hours.

25X+0.5= 4X+32

X= 1.5

Or (32-0.5)÷(25-4)= 1.5 hours.

There is a balance with only 5g and 30g weights. Divide 300 grams of salt into three equal parts, weigh it at least several times and write your name.

As long as1100g is weighed, the remaining 200g will be weighed together with the weighed100g.

35+35+30 = 100g

It only needs to be weighed four times. ..