industry 1:  x +  y = 300
 industry 2: 6x +  z = 900
 industry 3: 4y + 3z = 1700 ⇒ x = 100, y = 200, z = 300.

given that a factor is used in the production of a range of first-order goods, its value is determined by the good that is worth the least among all the goods in the range. if the goby sees a potential danger, it will flick or beat its tail on the shrimp's antennae. it occurs naturally in grape juice. they finally tamed the blaze by running lines to hydrants outside the park. 