The average weekly number of toy trains produced by Factory C and D is 3305. The average weekly number of toy trains produced by Factory C and E is 6767. If Factory D produced ²₅ as many toy trains as Factory E each week, how many toy trains does Factory C produce weekly?
Total toy trains that Factory C and Factory D produced
= 3305 x 2
= 6610

Total toy trains that Factory C and Factory E produced
= 6767 x 2
= 13534

Number of toy trains produced by Factory D = 2 u
Number of toy trains produced by Factory E = 5 u

Factory C's toys + 2 u = 6610 --- (1)
Factory C's toys + 5 u = 13534 --- (2)

(2) - (1)
5 u - 2 u = 13534 - 6610
3 u = 6924
1 u = 6924 ÷ 3 = 2308

Number of toy trains produced by D
= 2 u
= 2 x 2308
= 4616

Number of toy trains produced by C
= 6610 - 4616
= 1994

Answer(s): 1994