Tom's online class requires 10 tests, and he needs to score 70 or higher to pass the class. He took 9 tests so far and his average is 68. What is the lowest score on the last test that will let him pass the course?

Answer 1

He has 9*68=612 points so far
He needs 10*70=700 points to achieve his desired average

So, haw many more points does he need?