Math: The ratio of Sally's money to Jill's money is 3:5. Together, they have $100 dollars, so how much money does Jill have?

Sally has 3/5 of Jill's total. If together they have $100, you must divide $100 by 8 (3+5) to see what each part is worth. You arrive at $12.5. If you multiply that by 5, you get Jill's part ($62.5), and by 3 you get Sally's part ($37.5).

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