Select useful microorganisms from the pair given below.
a. Lactobacillus, Rhizobium
b. Lactobacillus, Mycobacterium
c. Yeast, Typhoid causing microbe
d. None of these.
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1
Answer:
a. lactobacillus and rhizobium are the microorganisms that are useful
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(2 + x) (7x) = (5 - x) (4+ x) (by cross multiplication )
14 - 2x +7x - x^2 = 20 + 5x - 4x - x^2
14+ 5x = 20 + x
4x = 6
x = 6/4
x = 1.5
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