A basket of eggs:

1 1 take it, just finished taking it.

Two out of two leaves 1.

Three, three, just finished.

Four out of four leaves 1.

Five out of five leaves 1.

Six, six, three left.

Seven, seven, just finished eating.

Eight out of eight leaves 1.

Nine, nine, just finished eating.

How many eggs are there in the basket?

1 1 just finished eating, 3 just finished eating, 7 just finished eating, 9 just finished eating, and the number of eggs in the box is a multiple of 4*9 =63.

Binary selection 1, 55 selection 1, unit number 1.

So look for the following numbers: 63×7, 63× 17, 63×27, 63× 37. ...

So the minimum number is 44 1.

The fast, middle and slow three cars start from the same place at the same time and catch up with the front cyclist along the same road. It is known that the speed of these three cars is 80km for the express train and 60km for the local train, and it takes them 7 minutes, 8 minutes and 14 minutes to catch up with the cyclist. What is the speed of the winning train?

Suppose the speed of the cyclist is x km/h.

(80-x)×7/60=(60-x)× 14/60

(80-x)×7=(60-x)× 14

560-7x=840- 14x

7x=280

x=40

The speed of the car is:

(80-40)×7/60÷8/60+40

=40×7/60÷8/60+40

= 14/3÷8/60+40

=35+40

=75 km/h

Quiz, IQ test. A * * *, how many squares are there?

16+9+4+5+5+ 1=40 (pieces)

Test everyone: this is a math problem that can measure whether a person has a business mind. Master Wang sells fish. I bought a catty of fish for 45 yuan, and now I'm having a sale at a loss. Customer 35 yuan bought a catty and gave Master Wang fake money 100 yuan. Master Wang had no change, so he asked his neighbor to change it 100 yuan. Afterwards, neighbors found that the money was fake during the process of saving money, and it was confiscated by the bank. Master Wang also lost his neighbor 100 yuan. How much did Master Wang lose?

Note: the difference between Jin and kg

A * * * lost100+(45× 2-35) =100+55 =155 yuan.