Q: There are 40 students in the 6th grade. 25% of them wear glasses and 40% of them wear contact lenses. How many students do not wear any vision assistance wear?
A: There are 40 x 25% = 10 students who wear glasses. There are 40 x 40% = 16 students who wear contact lenses. There are 10 + 16 = 26 students who wear vision assistance. There are 40 - 26 = 14 students who do not wear any vision assistance wear. The answer is 14.

Q: Hazel put up a lemonade stand. She sold half her lemonade to a construction crew. She sold 18 cups to kids on bikes. She gave away half that amount to her friends. Then she drank the last cup of lemonade herself. How many cups of lemonade did Hazel make?
A: Hazel sold 18 cups of lemonade to kids on bikes and gave half that amount, or 18 / 2 = 9 cups, away to friends. Hazel sold 18 cups + gave away 9 cups + drank 1 cup = 28 cups. Since Hazel sold half her lemonade to a construction crew, that means the 28 cups she sold to kids on bikes, gave away to friends and drank herself are the other half, so she sold 28 cups to the construction crew. In all, Hazel sold 28 + 28 = 56 cups of lemonade. The answer is 56.

Q: 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?
A:
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. The answer is 10.