1. 75% of a class with 32 students are 10-year-old students and the rest are 11-year-old students....

If x represents the number of 11-year-old students, then the number of 10-year-old students is 32 - x. Since 75% of the class are 10-year-olds, we have 0.75(32) = 24. Therefore, the number of 11-year-old students is 8.

Let x be the number of 11-year-old students. Then the number of 10-year-old students is 0.75(32) = 24. The total number of 11-year-old students is 32 - 24 = 8.

Let x be the number of 11-year-old students. The number of 10-year-old students is 75% of 32, which is 0.75 x 32 = 24. Therefore, the number of 11-year-old students is 32 - 24 = 8.

Let n be the total number of students in the class. 75% of n are 10-year-old students, which means 0.75n = 24. Solving for n, n = 32. Therefore, the number of 11-year-old students is 32 - 24 = 8.

Let x be the number of 11-year-old students. Since 75% of the class are 10-year-olds, the number of 10-year-old students is 0.75 x 32 = 24. Therefore, the number of 11-year-old students is 32 - 24 = 8.