Direct variation problems

Solve:

1. y ∝ x. When x = 5, y = 20. Find y when x = 8.
2. p ∝ q². When q = 3, p = 18. Find p when q = 5.
3. T ∝ √L. When L = 16, T = 12. Find T when L = 25.
4. Cost C varies directly as weight w. 3 kg costs $7.50. Find cost of 8 kg.

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