2010-01-25 00:01:45 +0000 #1
a truck transported ore, sunny day, delivered 16 times, rainy days can only be delivered 11 times a day. Win 195 times, 13 times the daily average transport. Q. These days, some days it rains, days are sunny?
set up rainy day for x days, sunny days for the y come to 11x +16 y = 195
also delivered a daily average of 13 times, availability shipped a total of 15 days, so, x + y = 15.
draw, x = 9, y = 6
Therefore, rain is 9 days, sunny days for 6 days
