We have a question: A man is returning home from work and trying to decide which route to take. His first route option includes 3 stoplights. This route will take him 10 minutes if all three lights are green, but each light that is red will add 3 minutes to the trip. The second route does not include any stoplights and takes 14 minutes. If the man chooses the first route, how much longer will his trip be if all 3 stoplights are red?
And an answer: 5
So how you got the answer?
If all 3 stoplights are red, the first route will take 10 + 3 * 3 = 19 minutes. Thus, the first route will take 19 - 14 = 5 minutes longer than the second route.

We have a question: Among the career home run leaders for MLB, Hank Aaron has 175 fewer than twice the number that Dave Winfield has. Hank Aaron hit 755 home runs. How many home runs did Dave Winfield hit in his career?
And an answer: 465
So how you got the answer?
Let x be the number of home runs Dave Winfield hit. 755 = 2x - 175. 930 = 2x. x = 465 home runs.

We have a question: John buys 1000 balloons. Each balloon holds 10 liters of air. If he buys 500-liter tanks of gas, how many tanks does he need to buy to fill all the balloons?
And an answer: 20
So how you got the answer?
He needs 1000 * 10 = 10000 liters of gas. So he needs 10000 / 500 = 20 tanks.