Answer:
c
Step-by-step explanation:
(24 - 15) x 4 - 3 x 2
9 x 4 - 3 x 2
36 - 6
30
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a:b = 5:4 = 35:28 (multiplying by 7)
b:c = 7:3 = 28:12 (multiplying by 4)
now a:b:c = 35:28:12
hope it helped
12 hours
6x4=24
24/2=12