1. A box contains a dozen bulbs in which few are defective and remaining are good. Which of the following cannot be a ratio of defective bulbs to good bulbs?
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2. If(3a + 5b) : (3a - 5b) = 5 : 1, then the value
of a : b will be
3. The production of company X is 120% of the production of company Y and 80% of the production of company Z. The respective ratio between the production of companies X,
Y and Z is