3 children rode the Ferris wheel at $5 reach for a total of 3 * $5 = $15. 5 children rode the merry - go - round at $3 each for a total of 5 * $3 = $15. 5 children bought 2 cones of ice cream each at $8 per cone for a total of 5 * 2 * $8 = $80. In total, they spent $15 + $15 + $80 = $110.
The answer: 110
Reverse engineering the question: A group of 5 children are taken to an amusement park. Only 3 of them were daring enough to get on the Ferris wheel which cost $5 per child. Everyone had a go at the merry-go-round (at $3 per child). On their way home, they bought 2 cones of ice cream each (each cone cost $8). How much did they spend altogether?

Carla is currently 30 - 6 = 24 years old. Louis is 55 - 24 = 31 years old at present.
The answer: 31
Reverse engineering the question: In 6 years, Carla will be 30 years old. The sum of the current ages of Carla and Louis is 55. How old is Louis now?

Mark has 50 / 100 * 6 = 3 points more than Eric. So Mark has 6 + 3 = 9 points. That means Samanta has 9 + 8 = 17 points. So in total Samanta, Mark, and Eric have 6 + 9 + 17 = 32 points.
The answer: 32
Reverse engineering the question: In a game, Samanta has 8 more points than Mark, and Mark has 50% more points than Eric. Eric has 6 points. How many points do Samanta, Mark, and Eric have in total?

Mario's $18 cut on Monday would have been 50% more expensive on Sunday or $18 * 50% = $9 more expensive. That means he would have paid $9 more on Sunday than what he paid ($18) on Monday or $9 + $18 = $27.
The answer: 27
Reverse engineering the question:
At Mario's barbershop haircuts are 50% more expensive during the weekends. If Mario paid $18 for his last haircut on Monday, how much he would have paid the day before?