The average weekly number of toy helicopters produced by Factory R and S is 3653. The average weekly number of toy helicopters produced by Factory R and T is 6928. If Factory S produced ⁴₉ as many toy helicopters as Factory T each week, how many toy helicopters does Factory R produce weekly?
Total toy helicopters that Factory R and Factory S produced
= 3653 x 2
= 7306

Total toy helicopters that Factory R and Factory T produced
= 6928 x 2
= 13856

Number of toy helicopters produced by Factory S = 4 u
Number of toy helicopters produced by Factory T = 9 u

Factory R's toys + 4 u = 7306 --- (1)
Factory R's toys + 9 u = 13856 --- (2)

(2) - (1)
9 u - 4 u = 13856 - 7306
5 u = 6550
1 u = 6550 ÷ 5 = 1310

Number of toy helicopters produced by S
= 4 u
= 4 x 1310
= 5240

Number of toy helicopters produced by R
= 7306 - 5240
= 2066

Answer(s): 2066