Study the given graph and answer the question that follows.

If 60% of the total number of students obtaining 50 marks or more but less than 70 marks are girls and 55% of the total number of students obtaining 70 marks or more but less than 90 marks are also girls, then the total number of girls obtaining 50 marks or more but less than 90 marks is:

261

Girls obtained marks 50 marks or more but less than 70 marks = \(\frac{3}{5}\) × ( 150 + 120 )

= 162

Girls obtained marks 70 or more but less than 90 marks = \(\frac{55}{100}\) × ( 100 + 80 )

= 99

Total number of girls obtaining 50 marks or more but less than 90 marks

= 162 + 99

= 261