I'm not sure if this is correct,
but, I got:
130cm x 100cm ?
13,000cm ?
If you want to solve the equation

for C, you can work like this: subtract P from both sides:

Add C to both sides:

337.44 is the exact answer. Happy to help.
Percentage of 9th graders that said no is approx. 14%
Percentage of opposers that were 9th graders is approx 6%