Rasio banyanya piring dan banyaknya gelas yg dibeli ibu adalah 3:5. Sedangkan rasio banyak gelas dan banyaknya mangkok yg ibu beli adl 4:3. Jika banyak piring g

Asumsikan:
- jumlah piring = a
- jumlah gelas = b
- jumlah mangkok = c

Pernyataan (1)
a:b = 3:5
a = (3/5)b ... (1)

Pernyataan (2)
b:c = 4:3
c = (3/4)b ... (2)

Pernyataan (3)
a + b + c = 94 ... (3)

Mencari jumlah gelas dari persamaan (3):
a + b + c = 94
(3/5)b + b + (3/4)b = 94
(12/20)b + (20/20)b + (15/20)b = 94
(47/20)b = 94
(1/20)b = 2
b = 40

a = (3/5)b
a = (3/5)*40
a = 24

c = (3/4)b
c = (3/4)*40
c = 30

Selisih piring dan mangkok = c - a = 30 - 24 = 6