The average weekly number of toy cars produced by Factory S and T is 3724. The average weekly number of toy cars produced by Factory S and U is 7135. If Factory T produced ²₅ as many toy cars as Factory U each week, how many toy cars does Factory S produce weekly?
Total toy cars that Factory S and Factory T produced
= 3724 x 2
= 7448

Total toy cars that Factory S and Factory U produced
= 7135 x 2
= 14270

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

Factory S's toys + 2 u = 7448 --- (1)
Factory S's toys + 5 u = 14270 --- (2)

(2) - (1)
5 u - 2 u = 14270 - 7448
3 u = 6822
1 u = 6822 ÷ 3 = 2274

Number of toy cars produced by T
= 2 u
= 2 x 2274
= 4548

Number of toy cars produced by S
= 7448 - 4548
= 2900

Answer(s): 2900