The weekly salary of Agnes is $15 x 8 = $120. So in a month, Agnes earns $120 x 4 = $480. Therefore, Mila needs to work for $480 / $10 = 48 hours to earn as much as Agnes's monthly earnings.
The answer: 48
Reverse engineering the question: There are two babysitters named Mila and Agnes. Mila makes $10 an hour while Agnes makes $15 an hour. Agnes works 8 hours each week. How many hours does Mila need to work to earn as much as Agnes in a month?

He ate 2 * 1 = 2 bags after dinner. So he ate 2 + 1 = 3 bags of chips.
The answer: 3
Reverse engineering the question: John eats a bag of chips for dinner and then eats twice as many after dinner. How many bags of chips did he eat?

He plays video games for 4 / 2 = 2 hours a day. He watches TV for 4 * 7 = 28 hours a week. He plays video games for 3 * 2 = 6 hours. So in total he spends 6 + 28 = 34 hours on those activities.
The answer: 34
Reverse engineering the question: Mike watches TV for 4 hours every day. On the days he plays video games he plays for half as long as he watches TV. If he plays video games 3 days a week how long does he spend watching TV and playing video games?

In one week, he bakes 3 * 12 = 36 apple pies. In one week, he bakes 2 * 12 = 24 cherry pies. He bakes 36 - 24 = 12 more apple pies.
The answer: 12
Reverse engineering the question:
Steve has decided to become a baker. On Mondays, Wednesdays and Fridays, he bakes apple pies. On Tuesdays and Thursdays, he bakes cherry pies. If he bakes 12 pies per day, how many more apple pies does he bake than cherry pies in one week?