Give the step-by-step reasoning process and then the final answer. Thirty-six marbles are divided between Mario and Manny in the ratio 4:5. If Manny decided to give 2 marbles to his brother, how many marbles does Manny have now?
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The marbles are divided into 4 + 5 = 9 parts. Each part consists 36 / 9 = 4 marbles. So Manny had 5 parts x 4 = 20 marbles. After giving 2 marbles to his brother, he now has 20 - 2 = 18 marbles left.
The final answer: 18.
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