Twice their Friday's earnings is $147 x 2 = $294. So, their Saturday earnings was $294 + $7 = $301. Their Sunday earnings was $147 + $78 = $225. Therefore, their total earnings in three days was $147 + $301 + $225 = $673.
The answer: 673
Reverse engineering the question: In a fundraiser car wash activity, the 5th graders raised $147 on Friday. On Saturday, they made $7 more than twice their Friday earnings. Their earnings on Sunday are $78 more than their earnings on Friday. How much did they earn in three days?
Reasoning and answer: If Grace has 30 pastries, then both Phoebe and Calvin each have 30 - 5 = 25 pastries. The total number of pastries that Phoebe and Calvin have is 25 + 25 = 50. Together, Phoebe, Calvin, and Grace have 50 + 30 = 80 pastries. Since Calvin and Phoebe each have 8 more pastries than Frank, then Frank has 25 - 8 = 17 pastries. Altogether, the four have 17 + 80 = 97 pastries.
The answer: 97
What was the question?
Question: Calvin and Phoebe each have 8 more pastries than Frank but only five less than Grace. If Grace has 30 pastries, calculate the total number of pastries that the four have?
Ali made 5 circles with 8 boxes each so he used 5 * 8 = 40 boxes. There were 80 boxes to start with so now there are 80 - 40 = 40 boxes left. Ernie used 10 boxes to make one circle so with 40 boxes he can make 40 / 10 = 4 circles.
The answer: 4
Reverse engineering the question: Ali and Ernie lined up boxes to make circles. Ali used 8 boxes to make each of his circles and Ernie used 10 for his. If they had 80 boxes to begin with and Ali makes 5 circles, how many circles can Ernie make?
Reasoning and answer: 140 / 4 = 35 of the students were dancers. 35 - 25 = 10 of the dancer students did not slow dance.
The answer: 10
What was the question?
Question: There were 140 kids in the junior prom. Of those, a fourth of them were dancers. Of the dancers, 25 danced the slow dance. How many of the dancer students did not slow dance?
Today Aunt May's cows gave her 365 gallons + 380 = 745 gallons of milk. She had 745 gallons - 612 gallons sold to the ice cream factory = 133 gallons of milk left. Combined with the leftover from yesterday, Aunt May has 133 gallons + 15 gallons = 148 gallons of milk.
The answer: 148
Reverse engineering the question: Aunt May milks her cows twice a day. This morning she got 365 gallons of milk. This evening she got 380 gallons. She sold 612 gallons to the local ice cream factory. She had 15 gallons left over from yesterday. How many gallons of milk does she have left?
The meals cost 16 + 14 = $30. So each paid 30 / 2 = $15. James left a tip of 30 * .2 = $6. So James paid 15 + 6 = $21.
The answer: 21
Reverse engineering the question:
James goes out to eat. He orders a steak and egg meal for $16. He is with his friend, who orders chicken fried steak for $14. His friend pays for half the bill and James pays the tip along with his half of the bill. They tip 20%. How much did James pay?