uang A = 2/3 uang B dan uang B = 2/5 uang C. jika jumlah uang mereka Rp 75.000,00, tentukan besar uang masing masing........

jawab

A= 2/3 B --> A : B = 2 : 3
B = 2/5 C --> B : C = 2 : 5
A : B : C = (2x2) : 2(3) : 3(5) = 4 : 6 : 15
A + B + C = 25

A= 4/25  x 75.000 
A = 12.000

B = 6/25 x 75.000
B = 18.000

C= 15/25 x 75.000
C = 45.000

A = 2/3B = 2/3 x 2/5C = 4/15C
B = 2/5C

A+B+C = 4/15C + 2/5C + C = 75.000
10/15C + C = 75.000
1 2/3C = 75.000
5/3C = 75.000
C = 75.000 x 5/3
C = 45.000

A = 4/15C = 4/15 x 45.000 = 12.000
B = 2/5C = 2/5 x 45.000 = 18.000

jadi :
uang A = 12.000
uang B = 18.000
uang C = 45.000