Mishal and Aneta are addressing envelopes. Mishal got 15 envelopes done yesterday and can address 2 a minute. Aneta can address 3 in a minute and had finished 2 yesterday.

1) Find the equation that represents the total number of envelopes Mishal addresses.

2) Find the equation that represents the total number of envelopes Aneta addresses.

3) How many minutes until Aneta has 20 envelopes addressed in total?

4) How many total envelopes will Mishal have addressed after half an hour?