Explanation:
12) 10/5 = x/8
cross multiply
8×10 = 5×x
80 = 5x
dividing through by 5
16 = x
13) 2/4 = x/6
2× 6 = 4 × x
12 = 4x
dividing through by 4
3 = x
14) 6/x = 4/5
6×4 = x× 5
24 = 5x
dividing through with 5
24= x
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