6.5 is the answer. You can check by 6.5x8=52
30 minutes
you are welcome in advance
The money multiplier is 1/ 0.12
Johnny ate 8 pies in 5 minutes
He must have ate 1 pie in (5/8) minutes
(5/8) minutes = 5/8 * 60 = 75/2 = 37.5 seconds
On each pie he spent 37.5 seconds.