Four long - sleeved jerseys cost $15 x 4 = $60. So the striped jerseys amount to $80 - $60 = $20. Hence, Justin bought $20 / $10 = 2 striped jerseys.
The answer: 2
Reverse engineering the question: Justin bought some jerseys. He bought four long-sleeved ones that cost $15 each, and some striped ones that cost $10 each. How many striped jerseys did Justin buy if he spent a total of $80?


Reasoning and answer: 10 cans are holding 8 liters each for a total of 10 * 8 = 80 liters. There are 290 - 80 = 210 litres left. There are 24 - 10 = 14 cans left. Each of the remaining cans is holding 210 / 14 = 15 liters each.
The answer: 15
What was the question?
Question: There are 290 liters of oil in 24 cans. If 10 of the cans are holding 8 liters each, how much oil is each of the remaining cans holding?


After 1 year Jim has gained $80 * 0.15 = $12. Therefore, after 1 year his portfolio has grown to $80 + $12 = $92. He then adds $28 to this total, so his new portfolio total is $92 + $28 = $120 at the beginning of year 2. Next, this total grows by 10%, so he gains $120 * 0.10 = $12 across year 2. Thus, after year 2, his portfolio is worth $120 + $12 = $132.
The answer: 132
Reverse engineering the question: Jim starts with $80 in his investment portfolio. After 1 year it grows by 15%. He then adds another $28 to his portfolio. After 1 more year the combined portfolio grows by 10%. What is his final portfolio worth after 2 years from when he started?


Reasoning and answer: The total number of ml needed is 30 kg x 5 ml / kg = 150 ml. Each dose has to be 150 ml / 3 doses = 50 ml / dose.
The answer: 50
What was the question?
Question: A doctor needs to give medicine to a child, and he knows that he cannot give the same amount of medicine that he would give to an adult. The instructions say that for every kilogram of weight the child must be given 5 ml of medicine. The doctor knows that the child weighs 30 kilograms and that also the full dose has to be given in 3 equal parts. How many milligrams will each part of the dose be?


The total ratio representing the 500 cards is 11 + 9 = 20. The fraction of the total ratio that represents the number of cards that Ellis got is 11 / 20, and since there were 500 cards, Ellis got 11 / 20 * 500 = 275. If there were 500 cards, and Ellis received 275 cards, Orion received 500 - 275 = 225 cards. The number of cards that Ellis received more than Orion is 275 - 225 = 50 cards.
The answer: 50
Reverse engineering the question: The number of cards in a card game was 500. Two friends Ellis and Orion, playing together, divided the cards in the ratio of 11:9. How many more cards did Ellis get than Orion?


15 coins collected in hour one. 35 coins collected in hour two. 35 coins collected in hour three. 50 coins collected in hour four. Before giving her coworker some coins there were 15 + 35 + 35 + 50 = 135 coins. The number of coins after given 15 to her coworker is 135 - 15 = 120.
The answer: 120
Reverse engineering the question:
Every hour Joanne has to collect the coins out of the fountain inside the mall. During the first hour, she collected 15 coins. For the next two hours, she collected 35 coins from the fountain. In the fourth hour, she collected 50 coins from the fountain but she gave 15 of them to her coworker so she could buy a soda. How many coins did she have after the fourth hour?