Some ducks and horses are in a farm. These animals have a total of 17 heads and 58 legs.
- How many horses are there?
- How many ducks are there?
Number of
horses |
Number of
horses' legs |
Number of
ducks |
Number of
ducks' legs |
Total legs |
17
|
17 x 4
= 68 |
0
|
0
|
68 |
16
|
16 x 4
= 64 |
1
|
1 x 2
= 2 |
66
|
| 12 |
12 x 4
= 48 |
5
|
5 x 2
= 10 |
58
|
Number of legs if all are horses
= 17 x 4
= 68
Big difference between the number of legs of the horses and the ducks
= 68 - 58
= 10
Small difference between the number of legs of one horse and one duck
= 4 - 2
= 2
Numbers of ducks
= 10 ÷ 2
= 5
(b)
Number of horses
= 17 - 5
= 12
Answer(s): (a) 5; (b) 12
