Answer:
120 problems
Step-by-step explanation:
Given
[tex]Problems = 150[/tex]
[tex]Earnings = 80\%[/tex]
Required
Determine the number of questions
To do this, we simply multiply the earnings by the number of problems.
[tex]Questions = Earnings * Problems[/tex]
This gives:
[tex]Questions = 80\% * 150[/tex]
[tex]Questions = 120[/tex]
The students answered 120 problems correctly
