Answer:
Required units of Z is 440.
Step-by-step explanation:
Given 140 units of X required. Currently available number of X is 20. Each X requires 4 units of Z that is X=4Z. And there are 40 units of Z are available.
We have to find the net requirment of Z.
Since 20 units of X available and a total of 140 is required, so more
(140-20)=120 extra X is required.
Now given,
[tex]X=4Z\implies 120X=120\times 4Z=480Z[/tex]
We have 40 units of Z available, so,
(480-40)=440
Hence, 440 units of Z required to fulfil the reqirement of a total 140 units of X.