At the beginning of an academic year, there were 15 boys in a class and the number of girls was 20% greater. Later in the year, transfer students were admitted such that the number of girls doubled but the number of boys remained the same. How many students are in the class now? Give the rationale and then the answer.
Let's think step by step. The original number of girls was 20% greater than 15 (the number of boys) giving 15 + (20 / 100) * 15 = 18. After the admission of transfer students, the number of girls doubled to become 18 * 2 = 36. In addition to the 15 boys, there are now 15 + 36 = 51 students in the class.. The answer is: 51.

Millie, Monica, and Marius are taking subjects for school. Millie takes three more subjects than Marius, who takes 4 subjects more than Monica. If Monica took 10 subjects, how many subjects all take altogether? Give the rationale and then the answer.
Let's think step by step. If Monica took ten subjects, Marius took 10 + 4 = 14 subjects. Marius and Monica have 14 + 10 = 24 subjects which they've taken. Since Millie is taking three more subjects than Marius, she is taking 14 + 3 = 17 subjects. Together, the three have taken 24 + 17 = 41 subjects.. The answer is: 41.

There are 1250 pairs of shoes in the warehouse. There are 540 pairs that are blue. The rest are either green or purple. The number of green shoes is equal to the number of purple shoes. How many pairs of purple shoes are in the warehouse? Give the rationale and then the answer.
Let's think step by step. 1250 - 540 = 710. 710 / 2 = 355. There are 355 pairs of purple shoes in the warehouse.. The answer is: 355.