Basically, I had this work due in by tomorrow and have gone as far as I can with it - So Im left with stuff I dont know how to do. Ill be pressing on with it through the night, but Ive skimmed over it and found the following that I will need some help with:

Done the other 2, just this random question left.(8) An engineering firm buys in nuts, bolts and washers for the following prices:

nuts = 8p each

bolts = 12p each

washers = 3p each

Over 3 months a total of 1520 nuts, bolts and washers are purchased for a price of £99:80 (ninety nine pounds and eighty pence). If 20 more nuts than bolts are purchased, how many types of each item are purchased in 3 months?