Answer :
So we're given the information that 350 is 70% of "x".
So let's make "x" the total amount of attempted passes.
We can re-write 70% like this: 70/100.
This means that 70/100 * x = 350.
Solve:
70/100x = 350.
Multiply 10 on both sides to get normal number:
70/100x * 10 = 350 * 10.
700/100x = 3500
7x = 3500
Divide by 7:
7x/7 = 3500/7
x = 500