A salesman has a 20% chance of a sale at his first stop, a 30% chance of a sale at his second stop and a 16% chance of a sale at both stops. Find the odds that
(a) he will make a sale at both stops. Reduced to lowest terms, odds are
to
.

(b) he will make a sale only at the first stop. Reduced to lowest terms, odds are
to
.

(c) he will make a sale at the second stop. Reduced to lowest terms, odds are
to
.