Marvin sold 35 candy bars at $2 each so 35 * 2 = $<<35*2=70>>70 worth of candy
Tina sold three times the amount of candy so $70 * 3 = $<<70*3=210>>210 worth of candy
If Tina sold $210 worth of candy and Marvin sold $70 in candy then 210 - 70 = $<<210-70=140>>140 more sold than Marvin
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