just count the animals and the legs:
c+k = 21
3c+4k = 68
Now solve as usual
A paddock contains some cockatoos (which have 2 legs) and kangaroos (which have 4 legs). The total number of animals is 21 and they have 68 legs in total. Using simultaneous equations, determine how many cockatoos and kangaroos there are in the paddock.
1 answer