The average weekly number of robots produced by Factory D and E is 3203. The average weekly number of robots produced by Factory D and F is 7063. If Factory E produced ²₇ as many robots as Factory F each week, how many robots does Factory D produce weekly?
Total robots that Factory D and Factory E produced
= 3203 x 2
= 6406

Total robots that Factory D and Factory F produced
= 7063 x 2
= 14126

Number of robots produced by Factory E = 2 u
Number of robots produced by Factory F = 7 u

Factory D's toys + 2 u = 6406 --- (1)
Factory D's toys + 7 u = 14126 --- (2)

(2) - (1)
7 u - 2 u = 14126 - 6406
5 u = 7720
1 u = 7720 ÷ 5 = 1544

Number of robots produced by E
= 2 u
= 2 x 1544
= 3088

Number of robots produced by D
= 6406 - 3088
= 3318

Answer(s): 3318