Emma started with a certain amount of money. She spent 2/5 of her money. She earned €5 the next day. Later, she lost 3/7 of her money, but she still had €20 left. How much did she start with?

Answer 1

had (3x/5 + 5)
(4/7)(3x/5 + 5) = 20

Answer 2

The answer at the back of the book is €50...

Answer 3

(4/7)(3x/5 + 5) = 20
4(3x +25) = 20 * 7 * 5
3x + 25 = 5 * 7 * 5 = 175
3 x = 150
x = 50
I guess the book is correct.