Some hens and cows are in a farm. These animals have a total of 22 heads and 68 legs.
- How many cows are there?
- How many hens are there?
Number of cows |
Number of cows' legs |
Number of hens |
Number of hens' legs |
Total legs |
22
|
22 x 4 = 88 |
0
|
0
|
88 |
21
|
21 x 4 = 84 |
1
|
1 x 2 = 2 |
86
|
12 |
12 x 4 = 48 |
10
|
10 x 2 = 20 |
68
|
Number of legs if all are cows
= 22 x 4
= 88
Big difference between the number of legs of the cows and the hens
= 88 - 68
= 20
Small difference between the number of legs of one cow and one hen
= 4 - 2
= 2
Numbers of hens
= 20 ÷ 2
= 10
(b)
Number of cows
= 22 - 10
= 12
Answer(s): (a) 10; (b) 12