At a light bulb factory 4 out of every 25 light bulbs are defective. How many light bulbs would you

At a light bulb factory 4 out of every 25 light bulbs are defective. How many light bulbs would you excpect to be defective out of 350 light bulbs

Set up a proportion of light bulbs to defects where d is the number of defects per 350 light bulbs:
4/25 = b/350

Type this proportion into our search engine, and we get:
b = 56