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50 / 90 = 30 / x
50x = 2700
5x = 270
x = 54 (B)
7. <BOC = 2 × <BAC
2 × 50 = 100 (D)
8. <BAC = 1 / 2 × <BOC
1 / 2 × 70 = 35 (A)
9. 5x + 4x = 180
9x = 180
x = 180 ÷ 9
x = 20 (C)