Karina was born in 1970 and she is currently twice as old as her brother. If her current age is 40, in what year was her brother born?
Let's think: If Karina is currently 40, and she is twice as old as her brother, then her brother is currently 40 / 2 = 20 years old. If Karina was born in 1970, then her brother was born in 1970 + 20 = 1990.. The answer is: 1990.

James collects all the fruits from his 2 trees. Each tree has 20 plants. Each plant has 1 seed and he plants 60% of those. How many trees did he plant?
Let's think: He got 20 * 2 = 40 seeds. That means he plants 40 * .6 = 24 trees.. The answer is: 24.

Dino does some online gig work for a living. He works 20 hours a month making $10 an hour. He works 30 hours a month making $20 an hour. He works 5 hours a month making $40 an hour. He pays $500 a month in expenses. How much money does Dino have left at the end of the month?
Let's think: Dino works 20 hours at a rate of $10 an hour, which means that work pays him 20 * 10 = 200 dollars a month. Dino works 30 hours at a rate of $20 an hour, which means that work pays him 30 * 20 = 600 dollars a month. Dino works 5 hours at a rate of $40 an hour, which means that work pays him 5 * 40 = 200 dollars a month. Altogether, this means Dino makes 200 + 200 + 600 = 1000 dollars a month. You subtract Dino's expenses of 500 from this amount, meaning he has 1000 - 500 = 500 dollars at the end of the month.. The answer is: 500.

By the time Anne is two times as old as Emile, Emile will be six times as old as Maude. If Maude will be 8 years old, how old will Anne be?
Let's think:
If Maude's age is 8 by the time Anne's age is four times Emile's age, Emile will be six times as old as Maude, which totals 6 * 8 = 48 years. If Emile's age is 48 years old by the time Anne's age is twice her number, Anne will be 2 * 48 = 96 years.. The answer is: 96.