Question

No 2 aja. *pake jalannn

Answer 1

A/4 = (a+15)/(4+6)
a/4 = (a+15)/(10)
a(10) = 4(a+15)
10a = 4a + 60
10a-4a = 60
6a = 60
a = 60/6
a = 10

b/4 = 10/(4+6)
b/4 = 10/10
b/4 = 1
b = 4

(4+6+c)/(a+15+5) = 4/a
(10+c)/30 = 4/10
10(10+c) = 4(30)
100 + 10c = 120
10c = 120-100
10c = 20
c= 20/10 = 2

d/(a+15+5) = b/a
d/30 = 4/10
10d = 120
d = 120/10 = 12

semoga bermanfaat :)