A man earns on the first day and spends Rs. 15 on the next day. He again earns Rs. 20 on the third day and spends Rs. 15 on the fourth day. If he continues to save like this, how soon will he have Rs. 60 in hand?
A. on 17th day
B. on 27th day
C. on 30th day
D. on 40th day

• answer is 17th day.
  for every 2 days, he saves rs.5.
  after 16 days, the savings become rs.40.
  on the 17th day, he earns rs.20
  so 40+20=rs.60.
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