medium · GMAT Quantitative Reasoning
A set is composed of two groups of numbers. Group 1 has an average of 100 and Group 2 has an average of 150. The average of the entire combined set is 120.
What is the ratio of the number of items in Group 1 to the number of items in Group 2?
- 5 : 3
- 2 : 3
- 4 : 1
- 1 : 1
- 3 : 2
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