Question

the fly weighs 90% of what she used to. if the fly currently weighs 0.018 grams, how many grams did she weigh before?

Answer 1

Let x be the weight of the fly before.
90% of x is 0.018 grams, so (90/100)*x = 0.018 grams.
Multiplying both sides by 100/90, we get x = 0.02 grams.
Therefore, the fly weighed 0.02 grams before. Answer: \boxed{0.02}.