Question
Oscar, Riordan and Tommy had a total of $90. Riordan had thrice as much money as Oscar. Tommy had twice as much money as Riordan. How much more money did Tommy have than Riordan?
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Oscar, Riordan and Tommy had a total of $90. Riordan had thrice as much money as Oscar. Tommy had twice as much money as Riordan. How much more money did Tommy have than Riordan?