In a batch of light bulbs, 30% are tinted. If 45 lightbulbs are tinted, how many lightbulbs are in the batch?

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Answer 1 · 2018-07-23T18:24:41

$150$

$30%to45" lightbulbs"$

$100%to45xx100/30=150" lightbulbs"$

Answer 2 · 2018-07-23T19:43:46

$150$ light bulbs

There is a comparison given between a percentage and a number of light bulbs. The aim is to find how many light bulbs will represent $100%$

$30/45 = 100/x" "(larr "percent")/(larr "light bulbs")$

$x = (45 xx100)/30$

$150$ light bulbs