Question 899103
You mean lowest score you can have and still make a 76% average.
Assume on two tests you get 100%.
{{{(74+100+100+X)/4>=76}}}
{{{274+X>=304}}}
{{{X>=30}}}
Then you could only afford to get a 30%. 
So anything lower than 100% on those two other test forces you to get a better than a 30%.