A factory has three types of machines, each of which works at its own constant rate. If 7 Machine As and 11 Machine Bs can produce 360 widgets per hour, and if 8 Machine As and 22 Machine Cs can produce 600 widgets per hour, how many widgets could one machine A, one Machine B, and one Machine C produce in one 8-hour day?
Choose the correct choice
A) 400  B) 475  C) 480  D) 625  E) 700
Let Machine A produce A widgets per hour. B produce B widgets per hour and C produce C widgets per hour.   7A+11B=360 ---(1)   8A+22480=600 ---(2)   Dividing (2) by 2   4A+11480=300.....(3)   Adding (1)(3)   11A+11B+11480 = 660   A+B+480=60 per hour   So for eight hrs = 60*8= 
<gadget id="calculator">60*8</gadget>
<output>480</output>
480= Answer = 480
<result>C</result>
A factory has three types of machines, each of which works at its own constant rate. If 7 Machine As and 11 Machine Bs can produce 360 widgets per hour, and if 8 Machine As and 22 Machine Cs can produce 600 widgets per hour, how many widgets could one machine A, one Machine B, and one Machine C produce in one 8-hour day?