Answer this question:The total number of years in a century is the same as the number of marbles Gideon has. If he gives 3/4 of the marbles to his sister and multiples the number of remaining marbles by 2, he gets his age five years from now. How old is Gideon now?
A century has 100 years, and if Gideon has as many marbles as the number of years in a century, he has 100 marbles. If he gives 3 / 4 of the marbles to his sister, he gives out 3 / 4 * 100 = 75 marbles. Gideon's total number of marbles remaining after giving 3 / 4 of the marbles to his sister is 100 - 75 = 25. When he multiplies the number of remaining marbles by 2, he gets his age five years from now, meaning he will be 25 * 2 = 50 years old five years from now. Currently, Gideon is 50 - 5 = 45 years old.
The answer is 45.

Answer this question:When Matty was born, the cost of a ticket to Mars was $1,000,000. The cost is halved every 10 years. How much will a ticket cost when Matty is 30?
First find the total number of times the cost is halved: 30 years / 10 years / halving = 3 halvings. Then halve the cost once: $1,000,000 / 2 = $500,000. Then halve the cost a second time: $500,000 / 2 = $250,000. Then halve the cost a third time: $250,000 / 2 = $125,000.
The answer is 125000.

Answer this question:Hallie borrows a book from the library. She reads the entire book in four days. She read 63 pages the first day. On the second day, she read twice the number of pages that she'd read on day one. On the third day, she read 10 mores pages than she read on day two. If the book is 354 pages long, how many pages did she read on the fourth day?
On day two, she read 63 * 2 = 126 pages. On day three, she read 126 + 10 = 136 pages. On day four, she read 354 - 63 - 126 - 136 = 29 pages to finish the book.
The answer is 29.

Answer this question:John earned $18 on Saturday but he only managed to earn half that amount on Sunday. He earned $20 the previous weekend. How much more money does he need to earn to give him the $60 he needs to buy a new pogo stick?
John earnt $18 / 2 = $9 on Sunday. In total, John made $18 + $9 + $20 = $47 over the two weekends. John needs $60 - $47 = $13 extra to buy the pogo stick.
The answer is 13.