Question

6 sets of____= 12 sets of 4
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Answer 1

6 sets of 2 = 12 sets of 4 because 4×3=12 and also 2×3=6

Answer 2

8 is the answer
6 sets of 8= 6*8 = 48
12 sets of 4= 12*4 =48
So both are equal