If four in a row right, then. Summation help!

[Ashley Sanders]

Hi all,

I am creating a math task where the subject starts at a certain number and 
then subtracts 7 from each correct answer after that. If at any point in 
the subtraction process the subject gives the wrong answer, they begin at 
the original number and start all over again. I have got it to work where 
it will reset itself to the original number if a wrong answer is given. The 
practice round has four subtraction trials. However, this could easily 
become 5, 6, 7, etc trials if the subject gets any answer wrong. Thus, I've 
had to change the weight of the line to higher than four, or else after 
four trials, it will continue to the actual task. 

Here lies the problem: If I set the weight of the line to, say, 99 to 
account for wrong answer resets, it will force the subject to go through 99 
subtraction trials. What I need it to do is after 4 right answers IN A ROW, 
continue to the task. If it's just an accuracy of four, it could be that 
they had to go back to the beginning four times and only got the first 
problem right each time. Thus, I need it to be four in a row to ensure that 
all four practice problems were answered correctly in sequential order. 

Does anyone have an idea of how to go about doing this? Your help would be 
greatly appreciated!

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