The average weekly number of robots produced by Factory R and S is 3507. The average weekly number of robots produced by Factory R and T is 6777. If Factory S produced ²₇ 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
= 3507 x 2
= 7014

Total robots that Factory R and Factory T produced
= 6777 x 2
= 13554

Number of robots produced by Factory S = 2 u
Number of robots produced by Factory T = 7 u

Factory R's toys + 2 u = 7014 --- (1)
Factory R's toys + 7 u = 13554 --- (2)

(2) - (1)
7 u - 2 u = 13554 - 7014
5 u = 6540
1 u = 6540 ÷ 5 = 1308

Number of robots produced by S
= 2 u
= 2 x 1308
= 2616

Number of robots produced by R
= 7014 - 2616
= 4398

Answer(s): 4398