Question

Russell has a collection of 1,500 pennies. Of these pennies, 20% are dated before 1980, 35% are dated from 1980 to 2000, and the rest are dated after 2000. How many pennies in Russell’s collection are dated after 2000?

Answer 1

100%-(20%+35%)=100%-55%=45%

45% of pennies are dated after 2000

45% of 1500=45•1500/100=45•15=675 pennies are dated after 2000