#1 2 diamond rings and 4 silver rings cost $1,440. a diamond ring and a silver ring cost $660. how much does a silver ring cost?
#2 logan and izzy had the same number of stickers. after izzy gave him 72 stickers, logan had three times as many stickers as izzy. how many stickers did they have altogether?
#3 david and amrita had an equal number of marbles. after armita gave 50 marbles to david he had 5 times as many marbles as her. find the total number of marbles they had.
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