Pj will begin her cake deliveries at 12: 20 . she asked to remind her 30 minutes before she has to leave. what time should i remind pj about her deliveries?

At 11:50  

Step-by-step explanation:

1. Subtract the hours and the minutes separately

12:  20

- 0: 30

12: -10

2. If the minutes are negative, subtract 1 from the hours and add 60 to the minutes.

12:    -10

- 1: + 60

11:   50

You should remind PJ about her deliveries at 11:50.

it is contrapositive

i could not see the question too well so check yourself again too . this is because i want you to get it correct.