The average weekly number of robots produced by Factory R and S is 3543. The average weekly number of robots produced by Factory R and T is 6630. If Factory S produced ²₉ as many robots as Factory T each week, how many robots does Factory R produce weekly?
Total robots that Factory R and Factory S produced
= 3543 x 2
= 7086

Total robots that Factory R and Factory T produced
= 6630 x 2
= 13260

Number of robots produced by Factory S = 2 u
Number of robots produced by Factory T = 9 u

Factory R's toys + 2 u = 7086 --- (1)
Factory R's toys + 9 u = 13260 --- (2)

(2) - (1)
9 u - 2 u = 13260 - 7086
7 u = 6174
1 u = 6174 ÷ 7 = 882

Number of robots produced by S
= 2 u
= 2 x 882
= 1764

Number of robots produced by R
= 7086 - 1764
= 5322

Answer(s): 5322