3) A trader bought some paraffin for $500. He paid $x for each litre of paraffin. a) Find, in terms of x, an expression for the number of liters he bought. b) Due to a leak, he lost 3 liters of paraffin. He sold the remainder of the paraffin for $1 per litre more than he paid for it. Write down an expression, in terms of x, for the sum of money he received.

c) He made a profit of $20.

I) Write down an equation, in x to represent this information, and show that it showes to

3x2 + 23x- 500 = 0 =

II) Solve the equation 3² + 23x - 500 = 0, giving both answers correct to one decimal place.

d) Find, correct to the nearest whole number, how many liters of paraffin he sold.