My question is: After Betty gave Stuart 40% of her marble collection, the number of marbles in Stuart's collection increased to 80. If Betty had 60 marbles, how many marbles did Stuart have initially? Your thoughts:
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If Betty had 60 marbles, she gave Stuart 40 / 100 * 60 = 24 marbles. Since the number of marbles in Stuart's collection increased to 80 after Betty gave him 24 marbles, the number of marbles he initially had is 80 - 24 = 56. The final answer: 56.
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