hitunglah nilai a.b.c.dan.d

a)
4/a = 6/(6+3)
4/a = 6/9
4 × 9 = 6 × a
36 = 6a
a = 36/6
a = 6

b)
8/12 = b/(b + 4)
8 × (b + 4) = b × 12
8b + 32 = 12b
32 = 12b - 8b
32 = 4b
b = 32/4
b = 8

c)
6/9 = 8/(8 + c)
6 × (8 + c) = 8 × 9
48 + 6c = 72
6c = 72 - 48
6c = 24
c = 24/6
c = 4

d)
4/12 = d/(6+d)
4 × (6+d) = d × 12
24 + 4d = 12d
24 = 12d - 4d
24 = 8d
d = 24/8
d = 3