Give the step-by-step reasoning process and then the final answer. Sam shared a sum of money between his three cousins Sandra, Amy and Ruth in the ratio 2:1:3 respectively. If Amy got $50, how much did Sandra get?
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Going by the ratio, for every 1 part that Amy gets, Sandra will get 2 parts. Since Amy got $50, Sandra will get 2 * $50 = $100.
The final answer: 100.
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