Math Question Help Please

Question

A girl used 2/5 of her money to buy a handbag and $20 to play for a watch. She had $25 left over. How much money did she start with?

Answer 1

so 20+25 = 45 accounts for 3/5 of the total amount

(3/5)X = 45

X = 45*5/3 = 45/3*5 = 15*5 = 75

so the handbag costs 2/5 * 75 = 150/5 = 30

that leaves her with 75-30=$45, as given

$75