Some geese and cows are in a farm. These animals have a total of 13 heads and 42 legs.
- How many cows are there?
- How many geese are there?
Number of cows |
Number of cows' legs |
Number of geese |
Number of geese' legs |
Total legs |
13
|
13 x 4 = 52 |
0
|
0
|
52 |
12
|
12 x 4 = 48 |
1
|
1 x 2 = 2 |
50
|
8 |
8 x 4 = 32 |
5
|
5 x 2 = 10 |
42
|
Number of legs if all are cows
= 13 x 4
= 52
Big difference between the number of legs of the cows and the geese
= 52 - 42
= 10
Small difference between the number of legs of one cow and one goose
= 4 - 2
= 2
Numbers of geese
= 10 ÷ 2
= 5
(b)
Number of cows
= 13 - 5
= 8
Answer(s): (a) 5; (b) 8