the probability would be 100% if your smart
Step-by-step explanation:
ok so think of this if you have 10 marbles but it never said anything about getting rid of marbles ,you can get rid of four marbles.
9r=3r+6
Subtract 3r from both sides
6r=6
Divide both sides by 6
r=1
That will be in a thursday
Increased by 15
past score was x
increased by 15 means he raised to 15+x
it was raised to 83%
therefor
x+15=83
first option is right (and first test was 68%)