A store sells pencils and erasers. It has a rule that for every pencil you buy, you must buy 2 erasers which cost 1/2 the price of the pencils. If they sold 20 pencils and earned $80, how much do erasers cost?
Let's think: They sold 40 erasers because 20 x 2 = 40. Therefore 20(Pencil Price) + (1 / 2)(40 x Pencil Price) = 80. Therefore 40(Pencil Price) = 80. Therefore (Pencil Price) equals 2 because 80 / 40 = 2. An eraser costs $1 because 2 / 2 = 1.. The answer is: 1.

Leonard is 4 years younger than Nina who is half as old as Jerome. If the sum of their ages is 36, what is Leonard's age?
Let's think: Let x be the age of Nina. So, Leonard's age is x - 4. And Jerome's age is 2x. Since the sum of their ages is 36, then the equation is x + x - 4 + 2x = 36. By combining like terms, the equation becomes 4x = 40. So the value of x which represents the age of Nina is x = 40 / 4 = 10. Therefore, Leonard is 10 - 4 = 6 years old.. The answer is: 6.

Since it is Maurice's turn to host this year’s neighborhood cookout, he goes to the local wholesale club to buy ground beef. The wholesale club sells ground beef in 5-pound packages. Maurice wants to make one 2-pound burger for each person that attends, so he purchases 4 packages of ground beef. How many people can Maurice invite to the cookout so that everybody, including himself, gets a burger?
Let's think: Maurice buys 4 * 5 = 20 pounds of ground beef. If 2 pounds of ground beef make a burger, then he can make 20 / 2 = 10 burgers. Given that Maurice will have 1 burger, he can invite 10 - 1 = 9 people.. The answer is: 9.

John's dog has a litter of 8 puppies. He gives away half of them. He keeps one of the remaining puppies. He then takes the remaining puppies and sells them each for $600. He had to give the owner of the stud $300. How much money does he profit?
Let's think:
He had 8 / 2 = 4 left after giving some puppies away. He then keeps one so he sells 4 - 1 = 3 puppies. That means he made 3 * 600 = $1800. So his profit was 1800 - 300 = $1500.. The answer is: 1500.