A book sold 39,600 copies in its first month of release. Suppose this represents 6.7 percent of the number of copies sold to date. How many copies have been sold to date?

Answer 1

Translate the statement of the problem into "39600 of the copies sold to date is equal to 6.7 out of every 100 copies sold up until now".

That is, 39600/(Copies Sold To Date) = 6.7/100.

Then Copies Sold To Date comes to 39600/0.067 or 591044.7761.

591044.7761 is closer to 591045 than to 591044 so the number of copies sold to date is taken as 591045.