The average weekly number of toy trains produced by Factory N and P is 3881. The average weekly number of toy trains produced by Factory N and Q is 6737. If Factory P produced ⁴₇ as many toy trains as Factory Q each week, how many toy trains does Factory N produce weekly?
Total toy trains that Factory N and Factory P produced
= 3881 x 2
= 7762

Total toy trains that Factory N and Factory Q produced
= 6737 x 2
= 13474

Number of toy trains produced by Factory P = 4 u
Number of toy trains produced by Factory Q = 7 u

Factory N's toys + 4 u = 7762 --- (1)
Factory N's toys + 7 u = 13474 --- (2)

(2) - (1)
7 u - 4 u = 13474 - 7762
3 u = 5712
1 u = 5712 ÷ 3 = 1904

Number of toy trains produced by P
= 4 u
= 4 x 1904
= 7616

Number of toy trains produced by N
= 7762 - 7616
= 146

Answer(s): 146