help me
va rog ajutor

b = 2a
c= 2b = 4 a
d= 2c = 8 a
a + 2a + 4a + 8a = 15 a
a = 360:15 = 24
b = 24 x 2 = 48
c = 24 x 4 = 96
d = 24 x 8 = 192