You can put this solution on YOUR website! We start by naming variables that represent how much each girl has.
Let L = number of pesos Lita has
Let R = number of pesos Rosa has
The first sentence "Lita has 15.50 pesos more than Rosa" implies that we can use addition to represent this formula.
And the second sentence "Together they have 71.50 pesos" also implies addition.
So now we have two equations and two unknowns. In order to solve we can use the substitution method. Our first equation has an expression for L, (15.5 + R), so we can replace the L in the second equation with this expression.
Now we solve for R.
So Rosa has 28 pesos. To find how many Lita has, we can use either equation to solve for L.
Thus Lita has 43.50 pesos.
