There are 5 more pelicans than rhinoceros in a zoo. If there is a total of 70 legs, how many pelicans are there in the zoo?
| |
Rhinoceros |
Pelicans |
Total |
| Number |
1 u |
1 u + 5 |
|
| Value |
4 |
2 |
|
| Total value |
4 u |
2 u + 10 |
6 u + 10 |
Number of rhinoceros = 1 u
Number of pelicans = 1 u + 5
Number of rhinoceros' legs
= 4 x 1 u
= 4 u
Number of pelicans' legs
= 2(1 u + 5)
= 2 u + 10
Total number of legs
= 4 u + 2 u + 10
= 6 u + 10
6 u + 10 = 70
6 u = 70 - 10
6 u = 70 - 10
6 u = 60
1 u = 60 ÷ 6 = 10
Number of pelicans
= 1 u + 5
= 10 + 5
= 15
Answer(s): 15
