The total number of songs downloaded is 10 songs + 15 songs + 3 songs = 28 songs. The total size of the songs is 28 songs x 5MB / song = 140 MB.
The answer: 140
Reverse engineering the question: Kira wants some new music on her phone. She downloads 10 songs in the morning. Later on that day, she finds 15 more songs she likes so she downloads them, and at night a friend of hers recommends 3 more songs she also downloads. Knowing that each song has a size of 5 MB, how much memory space in MB will the new songs occupy?

The second patient needs 6 + 5 = 11 sessions. The first two patients need 6 + 11 = 17 sessions total. 25 - 17 = 8 sessions.
The answer: 8
Reverse engineering the question: A psychiatrist has 4 patients that need 25 sessions in total. One of the patients needs 6 sessions. Another patient needs 5 more than that. How many sessions would the remaining patients need?

The total number of minutes he studies the three subjects is 60 + 80 + 40 = 180 minutes. Therefore, Sam spends 180 / 60 = 3 hours.
The answer: 3
Reverse engineering the question: Sam spends sixty minutes studying Science, eighty minutes in Math, and forty minutes in Literature. How many hours does Sam spend studying the three subjects?

On Sunday 2 x 2 = 4 papayas turned yellow. A total of 2 + 4 = 6 papayas turned yellow. There are 14 - 6 = 8 green papayas still left on the tree.
The answer: 8
Reverse engineering the question:
There are 14 green papayas on the papaya tree. On Friday, two of the fruits turned yellow. On Sunday, twice as many fruits as on Friday turn yellow. How many green papayas are left on the tree?