First we have to check the information they are giving in the problem. do we can see that the photocopier can copy 4 pages every 2 seconds.
so with this info we can calculate the ratio, or the number of copies that can be done in one second:
[tex]\begin{gathered} 4\to\text{ 2} \\ \text{? }\to\text{ 1} \end{gathered}[/tex]So we made a rule of 3 to solve that
[tex]\text{? = }\frac{4\times1}{2}\text{ = 2}[/tex]So, if the photocopier can print 2 copys every second, the we can calculate the the time that takes to print 120 pages:
[tex]\begin{gathered} 2\to\text{ 1} \\ 120\to\text{ ?} \end{gathered}[/tex]solving this rule of 3:
[tex]\text{? = }\frac{120\times1}{2}\text{ = 60}[/tex]so is going to take 60 seconds to copy 120 pages.
