[Illustration: 2/-1d. 2/-1d. 2/-1d. 2/-1d.]
207. Place four florins alternately with four pennies, and in four
moves, moving two adjacent coins each time, bring the florins
together and the pence together. When finished there must be no
spaces between the coins.
208. If 2 be added to the numerator of a certain fraction, it is made
equal to one-fifth, whilst if 2 be taken from the denominator it
becomes equal to one-sixth. Find the fraction.