Kathy had some money. She spent half the money on groceries. She spent 1/4 of the money on gas. She had $5.00 left. how mucb did she start with?

She spent 1/2 of the money on groceries and 1/4 of the money on gas. Let's say n is the money she had. 1/2 + 1/4 = 3/4. She spent 3/4 of her money. She had left 1/4. 1/4n = 5

n = 4*5 She had 20$