Oscar needs to increase his maximum running time from 20 - 2 = 18 miles. Oscar will need a total of 18 / ( 2 / 3 ) = 27 weeks to prepare.
The answer: 27
Reverse engineering the question: Oscar wants to train for a marathon. He plans to add 2/3 of a mile each week until he reaches a 20-mile run. How many weeks before the marathon should he start training if he has already run 2 miles?


Reasoning and answer: The blue weights weigh 4 * 2 = 8 pounds. The green weights weigh 5 * 3 = 15 pounds. The weights weigh 8 + 15 = 23 pounds. The total is then 23 + 2 = 25.
The answer: 25
What was the question?
Question: At a gym, the blue weights are 2 pounds each, and the green weights are 3 pounds each. Harry put 4 blue weights and 5 green weights onto a metal bar. The bar itself weighs 2 pounds. What is the total amount of weight, in pounds, of Harry's custom creation?


The total cost of maths books is 2 * 3 = 6 dollars. The total cost of science books is 6 * 3 = 18 dollars. The total cost for maths and science books is 6 + 18 = 24 dollars. The cost for art books is 30 - 24 = 6 dollars. Since he bought 3 art books, the cost for each art book will be 6 / 3 = 2 dollars.
The answer: 2
Reverse engineering the question: Alicia has to buy some books for the new school year. She buys 2 math books, 3 art books, and 6 science books, for a total of $30. If both the math and science books cost $3 each, what was the cost of each art book?


Reasoning and answer: The number of pink highlighters is 7 + 7 = 14. The number of blue highlighters is 14 + 5 = 19. There are 7 yellow highlighters. The total number of yellow, pink, and blue highlighters is 7 + 14 + 19 = 40.
The answer: 40
What was the question?
Question: In Carrie's desk drawer there are 7 yellow highlighters. There are 7 more pink highlighters than yellow highlighters, and there are 5 more blue highlighters than pink highlighters. How many highlighters are in Carrie's desk drawer in all?


The total cost for the legos are 3 x $250 = $750. The total cost for the toy swords is 7 x $120 = $840. The total cost for the play doughs is 10 x $35 = $350. Therefore the total cost for everything is $750 + $840 + $350 = $1940.
The answer: 1940
Reverse engineering the question: Last week, Tony went to a toy store and bought $250 a set of Lego blocks, a $120 worth toy sword, and a $35 play dough. He bought 3 sets of lego, 7 toy swords, and 10 play doughs. How much did Tony pay in total?


Let x represent the number of Chevys. Fords:3 + 2x. Buicks:4(3 + 2x) = 12 + 8x. Total:x + 3 + 2x + 12 + 8x = 301. 11x + 15 = 301. 11x = 286. x = 26. Buicks:12 + 8(26) = 220.
The answer: 220
Reverse engineering the question:
Jim collects model cars, and he has 301 models total. Jim has 4 times as many Buicks as Fords, and 3 more than twice the number of Fords than Chevys. How many Buicks does Jim have?