Math algebra (urgent!) help me! Thanks a lot!! (;
posted by Click6 on .
Mr lol bought x oranges for $30 and sold them at a profit of 5cents per orange. Write down the (i)cost price of an orange.
(ii)the selling price of an orange
When he had sold all except 20 of the oranges, he found he had received $28.
(iii) form an equation in x and show that it simplifies to xsquare + 20x 12000= 0

Click6, I can give you an intuitive answer but not a mathematical one.
My intuitive answer is there are 100 oranges bought in this problem. Thus each orange cost .30 or 100*.30=$30 The sellng price per orange is .35 or 5 cents more than the cost. 80 sold oranges times .35 equals $28 which fits with the stated parameters of your problem. 
Check your 61811, 12:51am post for
solution. 
what is the radicle of 150