Answer:
The correct answer is 20x-1
300,000+20,000+40
Three twenty thousand, forty
If 1/6 of the pan was left and there were 2 pieces left you just need to set 1/6 equal to 2/some number, this allows you to say that 1/6=2/x --> x/6=2-->x=12.
My explanation might be a little poor since this becomes fairly fundamental later on but hopefully it helps.
Simple interest: $495 (i=p•r•t)
