Consider the coal processing and delivery homework quesiton in a smaller scale: we have two mines (i = 1, 2) and two power plants (j = A, B). Let Xij = tons of coal produced at Mine i and delivered to Plantj, where i = 1, 2 and j = A, B. Mine 1's capacity is 13,000 tons and Mine 2's capacity is 15,000 tons, and the demand of Plants A and B are 11,000 tons and 14,000 tons, respectively. Sub-question 1: Which reflects that coal from Mine 1 cannot account for more than 35% of coal received at Plant A? A) X1A - 35*X18*X1A + X2A) 20 B) X1A - 35(X1A + X1B) 20 C) - 65X1A + 35X2A 50 D).65X1A - 35X2A 50 Sub-question 2: Which is the demand constraint for Plant A? A) X1A + X2B 11,000 B) X1A + X2B $ 11,000 C)X1A + X2A $ 11,000 D) X1A + X2A 2 11,000 Sub-question 3: Which is the supply constraint for Mine 1? A) X1A + X1B $ 13,000 B) X1A+ X1B 2 13,000 C)X1A + X2A $ 13,000 D) X1A + X2A 2 13,000 Consider the coal processing and delivery homework quesiton in a smaller scale: we have two mines (i = 1, 2) and two power plants (j = A, B). Let Xij = tons of coal produced at Mine i and delivered to Plantj, where i = 1, 2 and j = A, B. Mine 1's capacity is 13,000 tons and Mine 2's capacity is 15,000 tons, and the demand of Plants A and B are 11,000 tons and 14,000 tons, respectively. Sub-question 1: Which reflects that coal from Mine 1 cannot account for more than 35% of coal received at Plant A? A) X1A - 35*X18*X1A + X2A) 20 B) X1A - 35(X1A + X1B) 20 C) - 65X1A + 35X2A 50 D).65X1A - 35X2A 50 Sub-question 2: Which is the demand constraint for Plant A? A) X1A + X2B 11,000 B) X1A + X2B $ 11,000 C)X1A + X2A $ 11,000 D) X1A + X2A 2 11,000 Sub-question 3: Which is the supply constraint for Mine 1? A) X1A + X1B $ 13,000 B) X1A+ X1B 2 13,000 C)X1A + X2A $ 13,000 D) X1A + X2A 2 13,000