Can you make a real life equation with steps and then the answer

How can you use two-step equations to represent and solve real-world problems

Step-by-step explanation:

Fixed quantity + a ratio.

Ex.  Flat fee then $x per unit

Here are some examples that have appeared  

here on Wyzant.

Phone company charges flat fee of $20 per month plus

FIVE CENTS per minute. How many minutes for $100?

 100 = 0.05x + 20

 80 = 0.05x

 8000 = 5x

 x = 1600

Here's one that showed up at my job.

Software buffer can hold 525000 bytes = 525 mb

There is a 43 byte packet header and each transaction  

record is 255 bytes long. How many transaction records

can fit in the buffer including the header?

525000 = 255 N + 43

N = (525000 - 43)/255

N = 2058

Hope this helps you!