For his birthday, Geoffrey received clothes and money. His grandmother gave him €20, his aunt €25 and his uncle €30. With what he already had, he now has €125 in his wallet. He goes to a video game store and gets 3 games that cost 35 euros each. How much does he have left after this purchase? Give the rationale and then the answer.
Let's think step by step. Let’s calculate the total price of video games: 35€ X 3€ / game = 105€. Now let’s find out how much money Geoffrey has left by subtracting his spending from his starting amount of cash: 125€ - 105€ = 20€.. The answer is: 20.

A coach placed 15 tennis balls and 5 soccer balls each into 5 baskets. He gave 5 of his students a short period of time to remove as many balls each from a basket as they could. 3 of them removed 8 balls each and the other 2 removed a certain number of balls each. If a total of 56 balls are still in the baskets, how many balls did the other 2 students each remove? Give the rationale and then the answer.
Let's think step by step. Combining the tennis and soccer balls, there are 15 + 5 = 20 balls in each basket. There are 5 baskets, hence 5 * 20 = 100 balls in total. 3 students removed 8 balls each, they removed 3 * 8 = 24 balls. From the total number of balls, they left 100 - 24 = 76 balls. There are 56 balls left so the other 2 students must have removed a total of 76 - 56 = 20 balls. This means that each of these 2 students removed 20 / 2 = 10 balls.. The answer is: 10.

A farmer is growing corn. For every 4 seeds he plants, he gets one ear of corn, that he can sell for $.1. It costs $.5 for a bag with 100 seeds. If he makes $40 in profit, how many ears did he sell? Give the rationale and then the answer.
Let's think step by step. A single seed costs $.005 because .5 / 100 = .005. It costs $.02 cents to grow an ear of corn because .005 x 4 = .02. On each ear of corn he makes $.098 profit because .1 - .02 = .08. He sold 500 ears because 40 / .08 = 500.. The answer is: 500.