3 ÷ 4/5 = 3 × 5/4 = 15/4
25/6 ÷ 5/4 = 25/6 × 4/5 = (25×4)/(6×5) = (5×5×2×2)/(3×2×5) = (5×2)/(3) = 10/3
-8/7 × (-3/4) ÷ 9/16 = 8/7 × 3/4 × 16/9
= (8×3×16)/(7×4×9)
= (2×4×3×16)/(7×4×3×3)
= (2×16)/(7×3)
= 32/21
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3 ÷ 4/5 = 3 × 5/4 = 15/4
25/6 ÷ 5/4 = 25/6 × 4/5 = (25×4)/(6×5) = (5×5×2×2)/(3×2×5) = (5×2)/(3) = 10/3
-8/7 × (-3/4) ÷ 9/16 = 8/7 × 3/4 × 16/9
= (8×3×16)/(7×4×9)
= (2×4×3×16)/(7×4×3×3)
= (2×16)/(7×3)
= 32/21