There are 3 more eagles than grizzly bears in a zoo. If there is a total of 78 legs, how many eagles are there in the zoo?
| |
Grizzly Bears |
Eagles |
Total |
| Number |
1 u |
1 u + 3 |
|
| Value |
4 |
2 |
|
| Total value |
4 u |
2 u + 6 |
6 u + 6 |
Number of grizzly bears = 1 u
Number of eagles = 1 u + 3
Number of grizzly bears' legs
= 4 x 1 u
= 4 u
Number of eagles' legs
= 2(1 u + 3)
= 2 u + 6
Total number of legs
= 4 u + 2 u + 6
= 6 u + 6
6 u + 6 = 78
6 u = 78 - 6
6 u = 78 - 6
6 u = 72
1 u = 72 ÷ 6 = 12
Number of eagles
= 1 u + 3
= 12 + 3
= 15
Answer(s): 15
