### Brain Teasers

# Driving Through the Country

I decided to drive through the country leisurely. On the first day I did only 7 miles. On the last day I did 51 miles increasing my journey 4 miles each day. How many days did I travel and how far?

### Answer

Actually this can be done by Arithmetic Progression taking the first term as 7 and the difference as 4. We use the formulaSn = (a+l)n/2

where n=12, a=7 and l=51

Also last term is given as 51. 348 miles in 12 days

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