Question 1095944
<br>Since she has twice as many 20r notes as 50r notes, think of grouping the notes into groups of one 50r note and two 20r notes.  Then each group is 90 rupees.<br>
Since she has a total of 2700 rupees, the number of these groups she has must be 2700/90 = 30.<br>
So all together she has 30 50r notes and 60 20r notes.