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The specific gravity of coal is heighest in

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The hardness of plagioclase felspars Limiting depth of bord and pillar method Consider the following linear programming problem: Maximize z = 3x + 2y s.t. 3x + 2y ≥ 15 2x + 3y ≤ 6 x ≥ 0, y ≥ 0 The above linear programming problem has If the roof is moderate strength, artificially supported; tabular arid steep deposit the method employed is . . . . . . . . A dry rock sample of diameter 50 mm and length 100 mm weighs 300 g. After saturating in brine solution of specific gravity 1.05, its weight increased to 330g. The porosity of the rock sample in percentage is