2000019207

SubArea: 
Systems of linear equations and inequalities
Level: 
B
Project ID: 
2000019207
Accepted: 
0
Clonable: 
0
Easy: 
0
Adam went to a shop where he bought 7 buns and 2 cakes for 64 Kč. Mirek bought 5 buns, 3 cakes and 4 rolls for 79 Kč. Petra went to the same shop as Adam and Mirek and bought 5 buns and 4 rolls. Since it was only 20 minutes to closing, she got a discount for each piece of bakery goods worth 1 Kč and so she paid 37 Kč. Which of the following statements about the prices of goods before the discount is the only incorrect?
2 buns and 1 cake altogether cost more than 16 rolls
The cake is more expensive than a bun and a roll altogether.
3 cakes cost more than 8 rolls.
Buying 10 pieces of each (a bun, cake, and a roll) cost more than 200 Kč.