Some chickens and goats are in a farm. These animals have a total of 13 heads and 40 legs.
- How many goats are there?
- How many chickens are there?
Number of
goats |
Number of
goats' legs |
Number of
chickens |
Number of
chickens' legs |
Total legs |
13
|
13 x 4
= 52 |
0
|
0
|
52 |
12
|
12 x 4
= 48 |
1
|
1 x 2
= 2 |
50
|
| 7 |
7 x 4
= 28 |
6
|
6 x 2
= 12 |
40
|
Number of legs if all are goats
= 13 x 4
= 52
Big difference between the number of legs of the goats and the chickens
= 52 - 40
= 12
Small difference between the number of legs of one goat and one chicken
= 4 - 2
= 2
Numbers of chickens
= 12 ÷ 2
= 6
(b)
Number of goats
= 13 - 6
= 7
Answer(s): (a) 6; (b) 7
