Question

The price of a packet of salt goes up by 9 cents. The old price is four-fifths of the new price. Find the old and new prices. Show the calculations.

Answer 1

Answer:

old 36 cents

new 45 cents

So isolate the variable on the left side by dividing both sides by 4/5:

4/5*5/4n = 5/4*9

on the left 4/5 and 5/4 cancel each other out and you end up with:

n = 5/4*9 = (5*9)/4 = 45/4 = 11 1/4 or 11.25

The price of a packet of salt goes up to 9 cents.The old price is four-fifths of the new price.Find the old and new prices. [Hint:let the old price be n cents.So the new price is n+9 cents\