The average weekly number of toy planes produced by Factory A and B is 3567. The average weekly number of toy planes produced by Factory A and C is 6534. If Factory B produced ²₅ as many toy planes as Factory C each week, how many toy planes does Factory A produce weekly?
Total toy planes that Factory A and Factory B produced
= 3567 x 2
= 7134

Total toy planes that Factory A and Factory C produced
= 6534 x 2
= 13068

Number of toy planes produced by Factory B = 2 u
Number of toy planes produced by Factory C = 5 u

Factory A's toys + 2 u = 7134 --- (1)
Factory A's toys + 5 u = 13068 --- (2)

(2) - (1)
5 u - 2 u = 13068 - 7134
3 u = 5934
1 u = 5934 ÷ 3 = 1978

Number of toy planes produced by B
= 2 u
= 2 x 1978
= 3956

Number of toy planes produced by A
= 7134 - 3956
= 3178

Answer(s): 3178