Answers

2015-08-07T15:35:26+08:00
18x40=720
12x40=480
20x28=560
20x12=240
720+480+560+240=2000
1 1 1
2015-08-07T18:53:17+08:00
=720
=480
=560
=240
total is 2000
1 1 1