Final answer:
Desirce will need to work 4 hours to package at least 140 orders.
Step-by-step explanation:
To calculate the number of hours Desirce needs to work in order to package at least 140 orders, we can set up a proportion.
Desirce can package 35 orders per hour. Let's say she needs to work x hours to package at least 140 orders. So we have the proportion:
(35 orders / 1 hour) = (140 orders / x hours)
To solve for x, we can cross multiply:
35x = 140
Finally, we divide both sides of the equation by 35 to isolate x:
x = 140 / 35
x = 4
Therefore, Desirce will need to work 4 hours to package at least 140 orders.