We have a question: Radhika got a new gaming system and asked everyone to get her games as gifts to add to the games she already has that she bought with her gaming system. On Christmas, she is given 12 new video games. On her birthday in February, she is given 8 more video games. Radhika already owned 1/2 the number of games as what she was given on Christmas and her birthday. How many video games does she own now?
And an answer: 30
So how you got the answer?
Radhika was given 12 video games on Christmas and 8 video games on her birthday, so she was given 12 + 8 = 20 video games. She had 1 / 2 this many before she was given gifts, 20 / 2 = 10 video games she already owned. She was given 20 video games and had 10 already, 20 + 10 = 30 video games. Now Radhika has 30 video games.

We have a question: Tom wants to visit Barbados. He needs to get 10 different vaccines to go and a doctor's visit. They each cost $45 and the doctor's visit costs $250 but insurance will cover 80% of these medical bills. The trip itself cost $1200. How much will he have to pay?
And an answer: 1340
So how you got the answer?
The medical cost comes out to 45 * 10 + 250 = $700. Insurance covers 700 * .8 = $560. So he has to pay 700 - 560 = $140. Added to the cost of the trip he has to pay 1200 + 140 = $1340.

We have a question: 68% of all pies are eaten with forks. If there are 2000 pies of all kinds, how many of the pies are not eaten with forks?
And an answer: 640
So how you got the answer?
If there are 2000 pies of all kinds, and 68% of all pies are eaten with forks, there are 68 / 100 * 2000 = 1360 pies eaten with forks. The number of pies that are not eaten with pie is 2000 - 1360 = 640.