Question

No 1 dan 2. *pake jalan

Answer 1

1)
10 :  a = 5 : 4
5a = 10(4)
a = 40/.5 = 8

3 : 6 = a : 6
6a = 3(6)
a = 18/6 = 3

6 : a = 3 : 5
3a = 6(5)
a = 30/3 = 10

2)
4 : a = 6 : 15
6a = 4(15)
a = 60/6 = 10

4 : b = (4+6) : 10
4 : b = 10 : 10
10b  = 4(10)
b = 40/10 = 4

6 : 15 = c : 5
15 c = 6 (5)
c = 30/15 = 2