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Verified Answer :

The answer is 24/45

Let's check out all choices:
a) 6:10 = 3:5
    6 5 = 10 3
    30 = 30
Therefore, equivalent!

b) 6:10 = 9:15
    6 15 = 10 9
    90 = 90
Therefore, equivalent!

c) 6:10 = 48:80
    6 80 = 10 48
    480 = 480
Therefore, equivalent!

d) 6:10 = 24:45
    6 45 = 10 24
    270 ≠ 240
Therefore, inequivalent!