There are 2 times as many cats as parrots.
There are 50 legs altogether.
- Find the number of animals.
- Find the number of less cats than parrots.
- How many more cats' legs are there than parrots' legs?
| |
Cats |
Parrots |
Total |
Difference |
| Number (Animals) |
2 u |
1 u |
3 u |
1 u |
| Value (Legs) |
4 |
2 |
|
|
| Total value (Total legs) |
8 u |
2 u |
10 u |
6 u |
$
Choose the animal type with a smaller number to be 1 u.
Let the number of parrots be 1 u.
Number of parrots = 1 u
Number of cats = 2 u
Number of parrots' legs = 2 x 1 u = 2 u
Number of cats' legs = 4 x 2 u = 8 u
Total number of legs
= 8 u + 2 u
= 10 u
10 u = 50
1 u = 50 ÷ 10 = 5
(a)
Number of animals
= 2 u + 1 u
= 3 u
= 3 x 5
= 15
(b)
Number of less cats than parrots
= 2 u - 1 u
= 1 u
= 1 x 5
= 5
(c)
Number of more cats' legs than parrots' legs
= 8 u - 2 u
= 6 u
= 6 x 5 = 30
Answer(s): (a) 15; (b) 5; (c) 30
