The average weekly number of robots produced by Factory Z and A is 3701. The average weekly number of robots produced by Factory Z and B is 6257. If Factory A produced ⁴₇ as many robots as Factory B each week, how many robots does Factory Z produce weekly?
Total robots that Factory Z and Factory A produced
= 3701 x 2
= 7402

Total robots that Factory Z and Factory B produced
= 6257 x 2
= 12514

Number of robots produced by Factory A = 4 u
Number of robots produced by Factory B = 7 u

Factory Z's toys + 4 u = 7402 --- (1)
Factory Z's toys + 7 u = 12514 --- (2)

(2) - (1)
7 u - 4 u = 12514 - 7402
3 u = 5112
1 u = 5112 ÷ 3 = 1704

Number of robots produced by A
= 4 u
= 4 x 1704
= 6816

Number of robots produced by Z
= 7402 - 6816
= 586

Answer(s): 586