Mathematics · Ratio and Proportion
The students in three batches of a dance class are in the ratio 2 : 3 : 5. If 20 students increase in each batch, the ratio changes to 4 : 5 : 7. Find the total number of students in the three batches before the increase.
- 180
- 2150
- 3100✓
- 4120
Correct answer
100
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