Answer:
$ 78.70 is original amount
Step-by-step explanation:
she has x dollars....she spends 23.50
so what she has left is : x - 23.50
she keeps...I am assuming thats 25%.....of what she has left, which is 13.80
so 25% of what she has left is 13.80...
turn ur percent to a decimal
0.25(x - 23.50) = 13.80
0.25x - 5.875 = 13.80
0.25x = 13.80 + 5.875
0.25x = 19.675
x = 19.675 / 0.25
x = 78.70 <=======
lets check it...
78.70 - 23.50 = 55.20
25% of 55.20 = 0.25 * 55.20 = 13.80
correct....so it check out
