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Best answer

(i) 12

Hint:

5x = 3 × 20 ⇒ x = 12

(ii) 9

8x = 24 × 3 ⇒ x = 9

(iii) 4, 12

Hint:

10x = 8 × 5 = 40 ⇒ x = 4

10y = 8 × 15 = 120 ⇒ y = 12

(iv) 24, 2

Hint:

16y = 8 × 4 ⇒ y = 2

12 × 4 = 2x ⇒ x = 24

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