Perbandingan uang tini dan uang tono 5:9 selisih uang mereka RP 18.000 jumlah uang mereka adalah.....

Asumsi:
- uang tini = a
- uang tono = b
[tex] \frac{a}{b} = \frac{5}{9} [/tex]
a = (5/9) b

b - a = 18.000
b - (5/9)b = 18.000
(4/9) b = 18000
b = 40.500

a = (5/9) * 40.500
a = 22.500

jumlah uang keduanya = a + b = 22.500 + 40.500 = 63.000

To - Ti = 18000
To = Ti + 18000

9Ti = 5To
9Ti = 5 (Ti + 18000)
9Ti = 5Ti + 90000
9Ti - 5Ti = 90000
4Ti = 90000
Ti = 90000/4
Ti = 22.500

lalu cari To
To = Ti + 18000
To = 22500 + 18000
To = 40.500

jadi jumlah uang mereka,
40.500 + 22.500
= 63.000