Question

how do you work out "when sally went bowling, her scores were 108, 72, and 95. if she bowls a 4th game, what will her score need to be to give her an average of 91?

Answer 1

That's 108+72+95+x over 4 is equivalent to 91, then once you solve for x you get an answer of 89. She must score 89 points in her fourth game.