"The error of several operators + matches these operands"

I am creating a Money class for a school assignment. I defined the conversion from Money to double, I have a constructor for Money that accepts int, another constructor takes a double number, and I overloaded the + operator to add two objects of type Money. The error message appears when I try to do something like myMoney + 10where my myMoney is an object of type Money, and 10 is obviously an integer. Here is the rest of the relevant code:

class Money {
private:
    int dollars;
    int cents;
public:
    Money(double r);
    Money(int d) : dollars(d), cents(0) {}
    operator double();
}

Money operator+(Money a, Money b) {
    double r = double(a) + double(b);
    return Money(r);
}

Money::operator double() {
    return dollars+double(cents)/100;
}

Money::Money(double r) {
    ...
}

, Money(double(myMoney)+10), , , , . - ?