DAY 185
Four oranges and six apples cost $1.30. Six oranges and four apples cost $1.20. How many oranges can you buy for $1.00?

Answer:

10.........10 oranges and 10 apples cost $2.50. So an orange and an apple cost $.25.
The conditions of the problem could only be satisfied by an apple costing $.15 and an orange costing $.10

DAY 186
Which is greater: the number of seconds in 100 hours, or the number of inches in 100 yards?

Answer:

Seconds in 100 hours----by a factor of 100----3600 inches in 100 yards---coincidentally the same as the number of seconds in an hour.....360,000 seconds in 100 hours.