The ratio of Samantha’s postcards to Erica’s postcards was 8 to 5. Erica counted their actual number of postcards and found that she had 60 fewer postcards than Samantha. How many postcards does Erica have?

How do i multiply two digit numbers

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Onnie is considering doing some long term investing with money that she inherited. she would like to have $50,000 at the end of 30 years. approximately how much money would lonnie need to put into an account earning 6% interest compounded annually in order to meet her goal?