a machine makes electric bulb of which 2 in 35 are faulty it made 20 faulty bulbs in a day how many good ones did it make (with explanation )
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2 are faulty
⇒ 35 total
⇒ good 35-2=33
... good+faulty-total=x
⇒ 350= good +20
good 350-20-330
→ 20 faulty in day
... Ratio of faulty by total
... in a day
faulty 20
total total
20
35
× 35-350
Hence, 330
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