Verified answer

Ответ: ck = 12

kd = 16

Объяснение: Ck + kd = 28

Ck +4 = kd

ck + ck +4 = 28

2ck = 28-4

2ck= 24

ck= 24/2

ck= 12

kd = ck + 4

kd = 12 + 4

kd = 16