Question 129782
Mr.Lim buys 30kg of cheese at a certain price. She finds that if she had bought some cheaper cheese costing 95 cents less per kg , she could have had 32.5kg for the same amount of money . What is the price per kg of the cheese which is more expensive ? 

let x the the price per kg of the  more expensive cheese

30x=32.5(x-0.95)

then

-2.5x=-0.95(32.5)=-30.875
then x=30.875/2.5=12.35

R: the price is 12.35 per kg