There are 60 minutes in an hour so 1 hour 30 minutes is equivalent to [1 + (30 / 60)] hours = 1.5 hours. There are 7 days in a week so he spends 1.5 * 7 = 10.5 hours jogging every week. After 2 weeks he will have spent 2 * 10.5 = 21 hours jogging.
The answer: 21
Reverse engineering the question: Mr. John jogs for 1 hour 30 minutes in the morning every day. How much time (in hours) will he have spent jogging after two weeks?
Reasoning and answer: There are 5 - 1 = 4 more lions each month. There will be 4 * 12 = 48 more lions after 1 year. There were 148 - 48 = 100 lions in Londolozi at first.
The answer: 100
What was the question?
Question: There are some lions in Londolozi at first. Lion cubs are born at the rate of 5 per month and lions die at the rate of 1 per month. If there are 148 lions in Londolozi after 1 year, how many lions were there in Londolozi at first?
He buys a plain croissant for $3.50 and an almond croissant for $5.50 for a total of $3.50 + $5.50 = $9.00 on pastries per weekend. In one year, which is 52 weeks, he spends 52 * $9 = $468.00 on pastries.
The answer: 468
Reverse engineering the question: Harrison buys a regular croissant on Saturdays for $3.50 and an almond croissant for $5.50 on Sundays. How much does he spend on croissants in a year?
Reasoning and answer: Out of the first 100 balls, Ralph was able to hit 2 / 5 of them and not able to hit 3 / 5 of them, 3 / 5 x 100 = 60 tennis balls Ralph didn't hit. Out of the next 75 balls, Ralph was able to hit 1 / 3 of them and not able to hit 2 / 3 of them, 2 / 3 x 75 = 50 tennis balls that Ralph didn't hit. Combined, Ralph was not able to hit 60 + 50 = 110 tennis balls Ralph didn't hit.
The answer: 110
What was the question?
Question: Ralph is going to practice playing tennis with a tennis ball machine that shoots out tennis balls for Ralph to hit. He loads up the machine with 175 tennis balls to start with. Out of the first 100 balls, he manages to hit 2/5 of them. Of the next 75 tennis balls, he manages to hit 1/3 of them. Out of all the tennis balls, how many did Ralph not hit?
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.
The answer: 8
Reverse engineering the 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?
The plant supplier earned $50 x 20 = $1000 for the orchids. He earned $25 x 15 = $375 for the potted Chinese money plants. So, his total earnings was $1000 + $375 = $1375. Then he paid $40 x 2 = $80 to his workers. He used a total of $80 + $150 = $230 for the worker's pay and new pots. Hence, he was left with $1375 - $230 = $1145 from his earnings.
The answer: 1145
Reverse engineering the question:
A plant supplier was able to sell 20 pieces of orchids for $50 each and 15 pieces potted Chinese money plant for $25. The money he earned was then used to pay his two workers $40 each and to buy new pots worth $150. How much money was left from the plant supplier's earnings?