There are 6 more swans than rhinoceros in a zoo. If there is a total of 156 legs, how many swans are there in the zoo?
| |
Rhinoceros |
Swans |
Total |
| Number |
1 u |
1 u + 6 |
|
| Value |
4 |
2 |
|
| Total value |
4 u |
2 u + 12 |
6 u + 12 |
Number of rhinoceros = 1 u
Number of swans = 1 u + 6
Number of rhinoceros' legs
= 4 x 1 u
= 4 u
Number of swans' legs
= 2(1 u + 6)
= 2 u + 12
Total number of legs
= 4 u + 2 u + 12
= 6 u + 12
6 u + 12 = 156
6 u = 156 - 12
6 u = 156 - 12
6 u = 144
1 u = 144 ÷ 6 = 24
Number of swans
= 1 u + 6
= 24 + 6
= 30
Answer(s): 30
