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6. If x is 4 times bigger than y, and the difference between x and y is 9, what is x equal to?

  • 12
  • 10
  • 24
  • 9

7. There are 30 students in a class, the ratio of boys to girls is 2:1. Assuming the same number of boys, how many more girls are needed in the class to invert this ratio (i.e so that it is 1:2)?

  • 30
  • 20
  • 10
  • 40