[Question]: Bert bought some unique stamps for his collection. Before the purchase, he had only half the stamps he bought. If he bought 300 stamps, how many stamps does Bert have in total after the purchase?
[Answer]: Before the purchase, Bert had 300 * 1 / 2 = 150 stamps. So after the purchase he has 300 + 150 = 450 stamps.
So the answer is 450.

[Question]: Five less than three times the number of Doberman puppies plus the difference between the number of Doberman puppies and the number of Schnauzers is equal to 90. If the number of Doberman puppies is 20, how many Schnauzers are there?
[Answer]: Three times the number of Doberman puppies is 3 * 20 = 60. Five less than three times the number of Doberman puppies is 60 - 5 = 55. Let's say the number of Schnauzers is s. The difference between the number of Doberman puppies and the number of Schnauzers is s - 20. Five less than three times the number of Doberman puppies plus the difference between the number of Doberman puppies and the number of Schnauzers is equal to 90, meaning 55 + s - 20 = 90. The number of Schnauzers which is s + 55 - 20 = 90. This evaluates to s + 35 = 90. There are s = 55 Schnauzers.
So the answer is 55.

[Question]: Archibald eats 1 apple a day for two weeks. Over the next three weeks, he eats the same number of apples as the total of the first two weeks. Over the next two weeks, he eats 3 apples a day. Over these 7 weeks, how many apples does he average a week?
[Answer]:
He ate 14 apples the first two weeks because 14 x 1 = 14. He ate 14 apples in the next three weeks because 14 = 14. He ate 42 apples in the final two weeks because 14 x 3 = 42. He ate 70 apples in total. He averaged 10 apples a week because 70 / 7 = 10.
So the answer is 10.