Question

Bu rani membeli 1/4 kg jeruk dan 1/2 kg apel, kemudian ia membayar rp. 4.250,- sedangkan bu rina membeli 3/4 kg jeruk dan 1/4 kg apel , kemudian ia membayar rp. 5.250,- . berapa harga 1 kg apel dan 1 kg jeruk?

Answer 1

Bu rani = 1/4 x + 1/2 y =4.250
----------------- x4
bu rani = x+2y=17.000

bu rina = 3/4 x + 1/4 y = 5.250
----------------- x4
bu rina = 3x+y=21.000

x+2y=17.000 | x3 -> 3x+6y=51.000
3x+y=21.000 | x1 -> 3x+y=21.000
------------- -
5y = 30.000
y= 6.000

x+12.000=17.000
x = 5.000