100-5*3 32*(47- 17)

(2)480- 180+60 3 1+2*30 240/4*20

480-( 180+60)(3 1+2)*30 240/(4*20)

(4) Adult 15 yuan, child 8 yuan.

1, how much is the ticket for three adults and 1 children?

2. How much should I refund if I buy a 100 child ticket?

This is from my book. I come from Jiangsu, too. Take a sum ~ ~