Kim has exactly enough money to buy 40 oranges at \(3x\) cents each. If the price rose to \(4x\) cents per orange, how many oranges could she buy?
Let the amount of oranges that Kim could buy if the price rose to 4x cents per orange be n .
the amount of money Kim has = 40 * 3x
the amount of money Kim has = n * 4x
n * 4x = 40 * 3x
4nx = 120x
Divide both sides of the equation by x .
4n = 120
Divide both sides of the equation by 4 .
n = 30