(1) How much does it cost to buy a skipping rope?

1.4*25=35 yuan

(2) How much money is left after buying a skipping rope? How much is football? )

184-35= 149 yuan

(3) How many footballs can I buy?

149/ 14.9= 10.

Comprehensive formula: (184-1.4 * 25)/14.9.

=( 184-35)/ 14.9

= 149/ 14.9

= 10 (piece)

2.

(1) arithmetic method:

According to the fact that ducks are three times as big as chickens, chickens are twice as big as chickens, and ducks are three times as big as chickens, that is, four times as big as chickens and ducks, and four times corresponds to 2400, then one time is 2400 divided by 4 to get 600, that is, there are 600 chickens, and the remaining number of ducks is 2400 minus 600 to get 1800.

1+3=4 2400/4=600; 2400-600= 1800.

(2) Equation method:

Solution: Suppose there are X chickens, then there are 3X ducks. According to the meaning of the problem and equation, we can get:

X+3X=2400

4X=2400

X=600

3X= 1800