THIS IS THE ANSWER WITH WORKINGS GIVEN
26 days
Quick ratio = 0.9.
We know payables is $50,000 and therefore, receivables + cash = $45,000.
As receivables : cash is 2 : 2.5, so receivables = $20,000 and hence receivable days
are: (20,000/(40,000/0.15)) × 365 = 26 days