Alyssa and Abigail need to collect 100 empty cans for their Science project. As of today, Alyssa collected 30 while Abigail collected 43 empty cans. How many more empty cans should they collect?
Alyssa and Abigail collected a total of 30 + 43 = <<30+43=73>>73 empty cans as of today.
So, they still need to collect 100 - 73 = <<100-73=27>>27 more empty cans.
#### 27