[10] 
For the problem in the box below, enter the requested information:

Brent's lunchbox contained only strawberries, oranges, and pretzels.
The lunch contained 17 items, twice as many pretzels as
strawberries, and 3 more strawberries than oranges.
How many of each item were in Brent's lunchbox? 

Using English only, enter a definition for a variable "x": 
Let x = 
Let y = 
Let z = 
Using information in the boxed problem (above) and/or the variables "x",
"y", and "z" which you defined above, write 3 equations which
translate the boxed problem above:

1^{st} equation 
2^{nd} equation 
3^{rd} equation 
Enter (in the answer box, right) the number of pretzels in Brent's lunchbox:

