tolong bantuannya yang no.1 b,c sama yg no.2 b,c

1.b
6 : b = 21 : 49
6 / b = 21 / 49
6 x 49 = 21 x b
294 = 21 x b
b = 294 / 21
b = 14

1.c
18 : 21 = p : 28
18 / 21 = p / 28
18 x 28 = p x 21
504 = p x 21
p = 504 / 21
p = 24

2.b
(5x - 2) : 72 = 18 : 27
(5x - 2) / 72 = 18 / 27
(5x - 2) 27 = 18 (72)
135x - 54 = 1296
135x = 1296 + 54
135x = 1350
x = 1350 / 135
x = 10

2.c
8 : 10 = (y + 15) : 25
8 / 10 = (y + 15) / 25
8 (25) = (y + 15) 10
200 = 10y + 150
10y = 200 - 150
10y = 50
y = 50 / 10
y = 5