3 small ostriches and 9 small koalas * *: 1050 * 3 = 3 150 (yuan)

4 small ostriches, 10 small koalas, 1 small kangaroo ***4200 yuan.

Take 4 small ostriches, 10 small koalas and 1 small kangaroo * * 4,200 yuan (yuan) 1050*3=3 150 (yuan) and subtract 3 small ostriches and 9 small koalas * * * to get/kloc.