Adam has 11 chicken and donkeys.
These animals have 36 feet in all.
How many (a) chicken and (b) donkeys does Adam have?
| Number of chicken |
Number of chicken' legs |
Number of donkeys |
Number of donkeys' legs |
Total number of legs between
the chicken and the donkeys |
| 11 |
11 x 2 =
22 |
0 |
0 x 4 =
0 |
22 + 0 =
22 |
| 10 |
10 x 2 =
20 |
1 |
1 x 4 =
4 |
20 + 4 =
24 |
| 7 |
7 x 2 =
14 |
11 |
11 x 4 =
44 |
14 + 44 =
36 |
If all of the animals are chicken,
the number of legs needed
= 11 x 2
= 22
Total number of extra legs
= 36 - 22
= 14
Difference in the number of legs between 1 donkey and 1 chicken
= 4 - 2
= 2
The number of extra legs belongs to the donkeys.
Number of donkeys
= 14 ÷ 2
= 7 (b)
Number of chicken
= 11 - 7
= 4 (a)
Answer(s): (a) 4; (b) 7
