Well lets set up an equation 2 problems per second yields
[tex]2x[/tex]
for every second, x.
Now if we want the problems solved, y it will be equal to this product so
[tex]y = 2x[/tex]
Now lets plug in 60 seconds, which is 1 minute
[tex]y = 2(60) \\ y = 120[/tex]
It can solve 120 algebra problems in 1 minute.