1) 15 a) 30, 35,  b) 10, 15, 20, c) 5, 10, d) 5, 10, 15, 2) 25 a) 30, 35,  b) 5, 10, 15, c) 15, 20, 25, 30, d) 10, 15, 20, 3) 40 a) 5, 10, 15, b) 30, 35,  c) 10, 15, 20, d) 5, 10, 4) 20 a) 10, 15, 20, b) 30, 35,  c) 5, 10, d) 5, 10, 15, 5) 30 a) 15, 20, 25, b) 5, 10, 15, c) 10, 15, 20, d) 5, 10, 6) 35 a) 30, 35,  b) 10, 15, 20, c) 15, 20, 25, d) 15, 20, 25, 30,

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