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31 March, 19:10

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?

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  1. 31 March, 19:31
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    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
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