The average weekly number of toy cars produced by Factory R and S is 3850. The average weekly number of toy cars produced by Factory R and T is 7111. If Factory S produced ²₅ as many toy cars as Factory T each week, how many toy cars does Factory R produce weekly?
Total toy cars that Factory R and Factory S produced
= 3850 x 2
= 7700

Total toy cars that Factory R and Factory T produced
= 7111 x 2
= 14222

Number of toy cars produced by Factory S = 2 u
Number of toy cars produced by Factory T = 5 u

Factory R's toys + 2 u = 7700 --- (1)
Factory R's toys + 5 u = 14222 --- (2)

(2) - (1)
5 u - 2 u = 14222 - 7700
3 u = 6522
1 u = 6522 ÷ 3 = 2174

Number of toy cars produced by S
= 2 u
= 2 x 2174
= 4348

Number of toy cars produced by R
= 7700 - 4348
= 3352

Answer(s): 3352