Question

out of a dozen bulbs 4 were defective . find the percentage of good bulbs
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Answer 1

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$1 \: dozen \: of \: bulbs \: = \: 12 \: bulbs \\ in \: which \: 4 \: were \: defective. \\ \\ left \: bulbs \: = \: 12 \: - 4 \\ \: \: \: \: \: \: \: = \: 8 \: bulbs. \\ \\ percentge \: of \: good \: bulbs \: \\ = \frac{8}{12} \times 100 \\ \\ = \frac{200}{3} \\ \\ = 66.66 \%$

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