The first question: (197+199+196)/2 = 296 Mathematics: 296- 197=99 Nature: 296- 199=97 Language: 297. Second question: (1) 156 and 157 (2) The second question may be wrong. The sum of two pages must be singular, otherwise the landlord made a mistake. Question 3: Solution: Assuming that the number of female students is X, there are 2X male students. (2x-1 5)/3 = x/4x = 1212 = 24a: Class 4 (1) has 24 boys and 2 girls12. Question 4: Xiaojun: 600 meters ÷50 meters = 12 minutes.

Puppy: 12 minutes × 200m = 2400m.

The puppy ran 12 minutes and ran 2400 meters.