Question: Jolene and Phil have four children, each with the same birthday. They gave birth to their first child exactly 15 years ago. They gave birth to their second child exactly one year after the birth of their first child. They gave birth to their third child on the fourth birthday of their second child. Two years after the birth of their third child, they gave birth to their fourth child. How old, in years, is their fourth child?
Answer: Step-by-step reasoning process: Their 1st child was born 15 years ago, and therefore is 15 years old. Their 2nd child was born 1 year after their 15 - year - old child, and therefore is 15 - 1 = 14 years old. Their 3rd child was born 4 years after their 14 - year - old child, and therefore is 14 - 4 = 10 years old. Their 4th child was born 2 years after their 10 - year - old child, and therefore is 10 - 2 = 8 years old.
So the answer is 8.

Question: A couple with two children, ages 6 and 10 years old, decided to go to an amusement park. The regular ticket costs $109, but children below 12 years old have a $5 discount. If they gave the cashier $500, how much change will they receive?
Answer: Step-by-step reasoning process: The ticket costs 109 - 5 = $104 for each child. So the ticket cost of the two children is 104 x 2 = $208. The couple needs to pay the regular price, so it's 109 x 2 = $218. Thus, the family needs to pay a total of 208 + 218 = $426. Therefore, their change is 500 - 426 = $74.
So the answer is 74.

Question: Salvadore earned $1956. Santo earned half of what Salvadore earned. How much money did the two men earn together?
Answer: Step-by-step reasoning process: Santo = (1 / 2) 1956 = $978. 1956 + 978 = $2934. Together Salvadore and Santo earned $2934.
So the answer is 2934.

Question: In his phone gallery, Malachi has the number of selfies he took last year and this year in the ratio of 10:17. If he has 2430 photos in his gallery, how many more photos did he take this year than last year?
Answer:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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Step-by-step reasoning process: The total ratio representing the number of photos in the Malachi gallery is 10 + 17 = 27. The difference in the ratios representing the number of photos Malachi took this year and last year is 17 - 10 = 7. This year, Malachi took 7 / 27 * 2430 = 630 more photos than he took last year.
So the answer is 630.