The average weekly number of toy helicopters produced by Factory C and D is 3232. The average weekly number of toy helicopters produced by Factory C and E is 7137. If Factory D produced ²₇ as many toy helicopters as Factory E each week, how many toy helicopters does Factory C produce weekly?
Total toy helicopters that Factory C and Factory D produced
= 3232 x 2
= 6464

Total toy helicopters that Factory C and Factory E produced
= 7137 x 2
= 14274

Number of toy helicopters produced by Factory D = 2 u
Number of toy helicopters produced by Factory E = 7 u

Factory C's toys + 2 u = 6464 --- (1)
Factory C's toys + 7 u = 14274 --- (2)

(2) - (1)
7 u - 2 u = 14274 - 6464
5 u = 7810
1 u = 7810 ÷ 5 = 1562

Number of toy helicopters produced by D
= 2 u
= 2 x 1562
= 3124

Number of toy helicopters produced by C
= 6464 - 3124
= 3340

Answer(s): 3340