You know the total amount, 32.00, and the cost of each gallon, 1.60, so you can make an equation using x as the amount of gallons bought.
1.60x = 32.00
Now just divide 32.00 by 1.60
x= 32.00/1.60
x= 20
That is permuations
that would be 10! or 10*9*8*7*6*5*4*3*2*1=3628800 ways
Answer:
Sam
30
Step-by-step explanation:
Sam made a mistake when he said
. The steps should have been:

You are supposed to square 5 first before multiplying 2. Sam multiplied by 2 first. The correct answer is 30.
Abx=2*1/2*3=6/2=3
Hope this helps!