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Cari dulu
harga 1 ikat kangkung.
diketahui :
1 bayam = 2 kangkung,
jadi, diubah 20 bayam
= 20 × 2= 40 kangkung,
40 + 50 = 90 kangkung,
setelah itu, harga beli
bayam dan
kangkung ibu aminah =>
225.000 :
90 = 2.500,
jadi, harga 1 kangkung
= 2.500,
lalu ibu
aisyah membeli 25 bayam, 60
knkung.
maka,
25 × 2 = 50,
50 + 60 = 110,
110 × 2500 = 275.000,
jadi, harga yg
hrs dibayar ibu
aisah sebesar Rp 275.000
1b=2k. pers.1
20 b +50 k= 225.000. pers. 2
ditanya 25 b +60 k = ....
subtitusikan pers 1 dan 2 ..
20b+50k= 225.000.
20(2k)+ 50 k = 225.000
40k+ 50k= 225.000.
90k= 225.000
k =225.000/90=2500, k= 2500.
subtitusikan k ke pers. 1b=2k
1(b)= 2(2500)
b= 5000. jadi harga 25 bayam +60 kangkung
25(5000)+60(2500)= 125.000+ 150.000=
Rp.275.000.