Sammy got an average of 85% in four tests threethree of the scores were 79 97 85 find the fourth mark if he wrote a fifth test his average increase by 3 what is his fifth mark
For the 4th test,
79+97+85+x = 4*85
so, x = 79
Then, for the 5th test,
4*85 + y = 5*(85+3)
so, y=100