(1) How many second prizes are there?

125* 16%=20 (frame)

(2) How many third prizes are there?

125*( 16%+4%)=25 (frame)

These are very simple and can be mentioned a lot.

Eight questions:

The number of people who can't eat breakfast every day is 69 (39 1/85%-39 1 can be found).

There is no guarantee that the daily breakfast accounts for 15% of the total number of students in the school (1-85% can be found).

Total number of students in Binhai primary school: 39 1/85%=460 (persons)

Question 9:

480*( 1-5%)=456 (person)

10 questions:

(1263-1185)/1263 *100% is about 6%.

1 1 Question:

Example: (1) What percentage of the 20 programs are four dances?

How much is the percentage of 4 crosstalk in 20 programs less than that of 10 songs in 20 programs?

( 10/20-2/20)* 100%=40%

……

Question 12:

Maximum hatch: 900*60%=540 (only)

Minimum hatch: 900*40%=360 (only)

I hope it helps you!