The price of the tea was twice the price of the cheese, so the cheese cost was 10 / 2 = $5. The price of the butter was 80 / 100 * 5 = $4. If the bread was 2 times cheaper than butter, that means it cost 4 / 2 = $2. That means Ursula paid for all her shopping 2 + 4 + 5 + 10 = $21.
The answer: 21
Reverse engineering the question: Ursula went to the store and bought butter, bread, a package of cheese, and tea. The bread was 2 times cheaper than the butter, while the price of the butter was 80% of the price of cheese. Tea was the most expensive and cost twice the price of a package of cheese. If the tea cost $10, how much did Ursula pay for her purchases?

3 gold coins at 50 dollars a coin gives you 50 * 3 = 150 dollars. 5 silver coins at 25 dollars a coin give you 25 * 5 = 125 dollars. You have 30 + 125 + 150 = 305 dollars.
The answer: 305
Reverse engineering the question: A gold coin is worth 50 dollars and a silver coin is worth 25 dollars. If you have 3 gold coins, 5 silver coins, and 30 dollars cash, how much money do you have in dollars?

First find the total wait time for the swings in minutes: 3 kids * 2 minutes / kid = 6 minutes. Then convert that number to seconds: 6 minutes * 60 seconds / minute = 360 seconds. Then find the total number of kids waiting for the slide: 3 kids * 2 = 6 kids. Then find the total wait time for the slide: 15 seconds / kid * 6 kids = 90 seconds. Then subtract the total wait for the slide from the total wait for the swings to find the difference: 360 seconds - 90 seconds = 270 seconds.
The answer: 270
Reverse engineering the question: There are 3 kids waiting for the swings and twice as many kids waiting for the slide. If each kid waits 2 minutes for the swings and 15 seconds for the slide, how many seconds shorter is the shorter wait?

A full year has 12 months. So 2 years is 2 * 12 = 24 months. The loan amount is $6,000 that he will repay in 24 months so 6000 / 24 = $250 per month. If he paid his dad back in 5 years that 5 * 12 = 60 months. $6,000 loan spread out over 60 months is 6000 / 60 = $100 per month. To pay it off in 2 years instead of 5, Gary is paying 250 - 100 = $150 more per month.
The answer: 150
Reverse engineering the question:
Gary bought his first used car for $6,000. Gary borrowed the money from his dad who said he could pay him back the full amount over 5 years. Gary decided he would pay his dad back the full amount in 2 years. How much more is Gary spending per month to pay the loan off in 2 years instead of 5?