A spacecraft flying through normal space for seven hours at 2 - billion miles per hour travels 7 * 2 = 14 billion miles. A spacecraft flying through a black hole at 3 * 2 = 6 billion miles per hour. Thus, a spacecraft flying through a black hole for two hours travels 2 * 6 = 12 billion miles. Therefore, in total, the Zargon spacecraft will travel 14 + 12 = 26 billion miles.
The answer: 26
Reverse engineering the question: The Zargon Destroyer spacecraft can travel at 2 billion miles per hour in normal space, but when moving through a black hole they travel three times faster. If the Zargon Destroyer is making a voyage that travels seven hours in normal space and two hours through a black hole, how many billions of miles would they have traveled?

In the beginning, Jina has 5 teddies * 3 bunnies / teddy = 15 bunnies. So her mom decided to give her 15 bunnies * 2 teddies / bunny = 30 teddies. So in total Jina has 5 teddies + 15 bunnies + 1 koala + 30 teddies = 51 mascots.
The answer: 51
Reverse engineering the question: Jina likes to collect mascots. She has 5 teddies, 3 times more bunnies, and a koala bear. Her mom decided to give her two additional teddies for every bunny she has. How many mascots Jina has in total?

On Monday, he spent half of $80 leaving him with $80 - (1 / 2) * $80 = $40. On Tuesday, he spent 1 / 5th of $40 leaving $40 - (1 / 5) * 40 = $32. On Wednesday, he spent 3 / 8ths of $32 leaving $32 - (3 / 8) * $32 = $20.
The answer: 20
Reverse engineering the question: Bob started out the week with $80. On Monday alone, he spent half the money. On Tuesday, he spent one-fifth of the amount left from Monday. On Wednesday, he spent 3/8ths of the amount left from Tuesday. How much does he have left now?

The total square footage from the three bedrooms is 3 * 400 = 1200 square feet. The total square footage of the house is 1200 + 600 = 1800 square feet. Henrietta needs 1800 / 600 = 3 gallons of paint.
The answer: 3
Reverse engineering the question:
Henrietta is repainting her house. The walls in the living room take up 600 square feet. She has three bedrooms. The walls in each bedroom take up 400 square feet. If one gallon of paint can cover 600 square feet, how many gallons of paint does Henrietta need to paint her house?