Question 222455
Let x = score on first test.


So the next three tests will have scores of x+3, x+6, and x+9 (just add 3 to each previous score). Now average these scores and set that average equal to 69.5 to get:


{{{(x+(x+3)+(x+6)+(x+9))/4=69.5}}}



Now just solve the equation above to find 'x' which is the score on the first test. I'll let you do that. Let me know if you still need help.