The average weekly number of toy planes produced by Factory A and B is 3480. The average weekly number of toy planes produced by Factory A and C is 6325. If Factory B produced ²₇ 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
= 3480 x 2
= 6960

Total toy planes that Factory A and Factory C produced
= 6325 x 2
= 12650

Number of toy planes produced by Factory B = 2 u
Number of toy planes produced by Factory C = 7 u

Factory A's toys + 2 u = 6960 --- (1)
Factory A's toys + 7 u = 12650 --- (2)

(2) - (1)
7 u - 2 u = 12650 - 6960
5 u = 5690
1 u = 5690 ÷ 5 = 1138

Number of toy planes produced by B
= 2 u
= 2 x 1138
= 2276

Number of toy planes produced by A
= 6960 - 2276
= 4684

Answer(s): 4684